When a candle burns, which forms of energy does the chemical energy in the candle change to? A. light and sound B. heat and sound C. light and heat D. electric and light

Answer:

A decrease in length, or the use of a material with lower resistivity, or an increase in the cross-sectional area of the wire

Explanation:

The resistance of a wire is given by

[tex]R=\frac{\rho L}{A}[/tex]

where

[tex]\rho[/tex] is the resistivity of the material of the wire

L is the length of the wire

A is the cross-sectional area

We see that:

R is directly proportional to [tex]\rho[/tex] and L - therefore if we decrease one of these two, the resistance of the wire will decrease too

R is inversely proportional to A - therefore if the increase the cross-sectional area, the resistance of the wire will decrease

Answer:

A. shorter wires.

Explanation:

Answer:

Explanation:

The balance condition, to keep the gate from moving, requires that the net torque be zero, this is, the torques on both sides of the gate must be equal.

a) Torque applied by one of the children:

b) Torque applied by the second child:

c) Equilibrium condition:

In this Physics question involving torque, the second child needs to exert a force of about 233 N to ensure the gate remains stationary.

This is a problem involving the concept of torque in Physics. Torque, denoted by 'τ', is a measure of how much force acting on an object causes it to rotate. The torque produced by a force can be calculated using the formula τ = rFsinθ, where 'r' is the force applied, 'F' is the force, and the distance between the pivot point and the force application

'F' is the force applied, and 'θ' is the angle between the force vector and the line connecting the point of application and the pivot.

In this context, though, since the forces are applied perpendicularly, you can use a simplified version: τ = rF. For the gate to remain stationary, the torques exerted by the children must be equal, i.e., τ₁ = τ₂.

This means that (0.59 m * 170 N) = (0.43 m * F₂).

Solving the equation for F₂ (the force the second child has to exert) gives you F₂ = (0.59 m * 170 N) / 0.43 m, which computes to approximately 233 N.

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Answer: i believe the correct answer is c. 0.87lbs

19. Answer:

It is because the gravitational force of Earth on a car is much more than the magnetic force from a refrigerator magnet. The gravitational force of earth on an object is directly proportional to the mass of the object. Due to the large mass of the car. the gravitational force on it is much greater and a refrigerator magnet cannot be used to lift the car.

20. Answer:

No, a magnet can never have a single pole. When cut in half, it develops two poles again

This is explained by Gauss's law of magnetism according to which the divergence of magnetic field is zero. The magnetic field lines must form a closed loop. In order to form a balanced closed loop, a magnet must have two poles.

21. Answer:

If the frequency of a wave is increased, the wavelength decreases.

Let us assume a wave with velocity v and wavelength λ is moving with a frequency f. We know that the velocity of a wave is always constant and is given as:

v = fλ

or λ=v/f

the relationship between λ and f is given as:

λ ∝ 1/f

When frequency is increased, the wavelength decreases.

22. Answer:

Wavelength of an ocean wave = λ = 10 m

Frequency of the ocean wave = f = 4.0 Hz

Velocity of the wave = v = ?

We know that for a wave with wavelength λ and frequency f, the velocity of that wave is given by the formula:

                             v = fλ

Using the given values in the formula:

v = (4 Hz)(10 m)

v = (4 s⁻¹)(10 m)                     (f = 1/T and Hz = s⁻¹)

v = 40 ms⁻¹

23. Answer:

If the sound of a siren becomes lower in pitch, it means that the vehicle is moving away from you. This is because of Doppler's effect.

According to Doppler's effect, when the source is moving away from a stationary receiver, the wavelength of the wave increases and thus the frequency f of the wave decreases to frequency f'.

f' = f(V/(V + Vs)         (V = velocity of wave ;   Vs = Velocity of source)

24. Answer:

Two astronauts in space are unable to hear each other. This is because sound waves cannot travel in space.

Sound waves are longitudinal waves. They need a medium to travel. Sound travels to our year by vibrating through the air molecules. In deep space, there are no molecules to vibrate. So there is no sound.

25. Answer:

Electromagnetic waves can transfer energy through vacuum.

EM waves are produced from an oscillating charged particles. It contains electric field waves and magnetic field waves oscillating perpendicular to each other. The plane of propagation of EM wave is in a plane perpendicular to both of them.

Once in motion, EM waves are self-perpetuating. Change is one field produces the other and so on.

26. Answer:

Three types of electromagnetic waves:

Ultraviolet rays:

Waves that have wavelength just shorter than the visible rays. Example is the UV radiations from the sun that cause sunburns.

X-rays:

X-rays have wavelength even shorter than UV radiations. Example: X-rays are used to take pictures of bones. They can penetrate through skin and muscles.

Gamma rays:

Gamma rays are the shortest waves and have the most energy. Example: Gamma rays used in treating cancer.

27. Answer:

A leaf usually appears to be green because chlorophyll absorbs light in the red and the blue regions of the visible light spectrum. Green light is not absorbed but reflected, making the plant appear green. Similarly, A red flower appears red because it reflects wavelengths most strongly in the red part of the spectrum. Light in the other range is absorbed.

28. Answer:

Light waves have different speed in different mediums.

On reflection, it remains in the same medium. So the speed of light also remains constant.

In refraction, the medium changes and the speed changes as well. Light is slower in denser mediums. Velocity of the light wave will decrease in a denser medium. To keep frequency constant, the wavelength of the wave will also shorten.

29. Answer:

A Convex lens converges the light rays towards the principal axis. Where as a Concave lens diverges the light rays away from the principal axes.

Convex lens is thicker at the center while Concave lens is thinner at the center.

Convex lens has a positive focal length while the concave lens has a negative focal length.

30. Answer:

The mirror used in rear-view mirror of a car are slightly curved (convex mirror).

The mirror is curved in an attempt to eliminate blind spots for the driver, making it safer and easier to view objects on the back of the vehicle.

The warning, "Objects in mirror are closer than they appear." is important because it is true. The image formed by a convex mirror is far than that of the actual objects. So, the driver is warned.

The correct order of events in the development of rip currents is: (A) waves travel to the beach, (E) waves are broken by the sandbars, (C) waves reach the shore and the backwash returns to the ocean, and finally, (D) waves speed up and flow between the sandbars causing rip currents.

The order of events in the development of rip currents, which are strong channels of water flowing away from shore, can be described as follows:

The correct sequence, therefore, is A, E, C, D, B: A. Waves travel to the beach, E. Waves are broken by the sandbars, C. Waves reach the shore and go back to the ocean, D. Waves speed up and flow between the sandbars, B. Waves are trapped by the sandbars.

In the last step, the waves being trapped refers to the water that is pushed back towards the sea after the waves have broken, contributing to the formation of the rip current.

Answer:

[tex]v = 18.4 m/s[/tex]

Explanation:

When it reached to the top of the path the normal force is given as

[tex]F_n = 370 N[/tex]

initially the reading of the sensor will give the amount of the weight of the object

[tex]W = mg = 740 N[/tex]

[tex]m = 75.4 kg[/tex]

now at the top position of the path we will have

[tex]F_n + mg = \frac{mv^2}{R}[/tex]

[tex]370 + 740 = \frac{(75.4)v^2}{23}[/tex]

[tex]1110 = 3.28 v^2[/tex]

[tex]v = 18.4 m/s[/tex]

The speed of the rider at the top of the loop cannot be calculated with the given information.

To find the speed of the rider at the top of the loop, we can use the concept of centripetal force. In this case, the normal force provides the centripetal force required to keep the rider moving in a circular path. At the top of the loop, the normal force is equal to the sum of the rider's weight and the centripetal force:

N = mg + ω2r 

Where N is the normal force, m is the mass of the rider, g is the acceleration due to gravity, ω is the angular velocity (which is equal to the speed divided by the radius), and r is the radius of the loop. We can rewrite this equation as:

 ω = √(N/m - g)

 Given that the normal force at the top of the loop is 370 N and the radius is 23 m, we can calculate the speed:

 ω = √(370/740 - 9.8)

 ω = √(0.5 - 9.8)

 ω = √(-9.3)

Since the square root of a negative number is not a real number, it means that the rider does not have enough speed to complete the loop. Therefore, it is not possible to calculate the speed of the rider at the top of the loop based on the given information.

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Thomas Alva Edison was a North American scientist and inventor who is credited with the design of the electric bulb and many other patented inventions.

However, the bulb did not come out on the first attempt, and was sometimes questioned by his repeated "failures". But his patience and perseverance paid off, after approximately 10,000 attempts, he managed to obtain an incandescent bulb that would last for a long time.

It should be noted that Edison was once asked if he considered that he had had many failures before making the bulb work, hence his famous phrase:

That is why Edison is considered an example of perseverance.

Answer:

10,000

Explanation:

Answer:

D. Kepler's law can be deduced from Newton's laws of motion and gravity.

Explanation:

Answer:

D. Kepler's laws can be deduced from Newton's laws of motion and gravity.

Explanation:

The fraction of the real tract that was created is A. 1/4.

From the complete question, the model that was created is 2.25m long.

Therefore, since the real gi tract is 9 meters long, the fraction of the model created will be:

= 2.25/9

= 1/4

In conclusion, the fraction is 1/4.

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The fraction representing the model GI tract at 5 meters long to the real one at 9 meters is 5/9.

If the real gastrointestinal (GI) tract is 9 meters long and the model created is 5 meters in length, then to find the fraction that represents the model's length relative to the real GI tract, you would divide the length of the model by the length of the real GI tract. The calculation would be 5 meters (model) divided by 9 meters (real GI tract).

The fraction that represents the model's length to the real one is 5/9.

Hello There!

The law of conservation of mass states that "Matter/substances/energy cannot be created or destroyed, it can only be transferred from one state to state.

Answer:

F(t)=19.84N

Explanation:

The rest is in the picture.

F(t)=19.84N.

When two bodies in contact move with respect to each other, rubbing the surfaces in contact, the friction between them is called kinetic friction.

Kinetic friction f_k=\mu _k \times N

where \mu _k is the coefficient of kinetic friction and N is the normal force.

Here the block will experience forces,

1) The normal force  N  in the upward direction

2) The gravitational force F=Mg in the downward direction

3) The tension T, say in the right direction

4) The kinetic friction f_k =\mu _k \times N in the left direction

For vertical equilibrium, N=Mg

We have kinetic friction f_k =\mu _k \times N=\mu _k \times Mg

As the block moves towards the right with an acceleration,

Total force on the block f_t_o_t_a_l=Ma=T-f_k

Ma= T- \mu \times Mg

T=Ma+\mu _k\times Mg

= M(a+\mu_kg)

=4×(3+ 0.2×9.8)

=19.84 N

The tension in the string is 19.84 N.

In static friction, the frictional force resists the force that is applied to an object, and the object remains at rest until the force of static friction is overcome. In kinetic friction, the frictional force resists the motion of an object.

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There is 3 resistors all in a series.

The total resistance is 10 + 20 + 30 = 60 Ω

The current is the voltage divided by the resistance:

Current = 120 V / 60 Ω = 2 Amps.

Answer:

The ozone appears in Antarctica during the Arctic spring.

Explanation:

From September to early December, strong winds start to circulate around the Arctic and creates an atmospheric container.

Explanation:

The orbit of a body around another in space, is described by six orbital elements that determine its orientation, position, size and shape.

In the specific case of the shape of the orbit, this is determined by its eccentricity, which varies between 0 and 1 in the case of closed orbits (circle and ellipse). When the eccentricity is 0, the shape of the orbit is circular, when this value begins to vary until approaching 1 (without reaching 1), the shape of the orbit becomes more elliptical.

In this sense, a circular orbit will have an eccentriciy of zero.

An orbit's eccentricity measures its deviation from being a perfect circle. A circular orbit, where every point on the edge is an equal distance from the center, has an eccentricity of zero. This is true in celestial physics, where all orbits, including those of planets like Mars, demonstrate this principle.

In physics, the measure of how much an orbit deviates from being perfectly circular is referred to as its eccentricity (e). This concept is particularly relevant in the study of celestial bodies and their movement. In an elliptical or bound orbit, the eccentricity can range from 0 to less than 1. However, for a circular orbit, the eccentricity is always 0. This is because in a circle, the distance from the center to the edge is consistent all around, meaning the two foci coincide at the center, and thus, the eccentricity is zero.

An ellipse could be described as a circle of zero eccentricity, where the semimajor axis would equal the radius. We can use planets as an example. All planets have orbits with low eccentricities and for instance, Mars' eccentricity is greater than that of many other planets but still less than 0.1. This central attribute has allowed scientists to conclude that Mars's orbit is more of an ellipse than a circle, adding to the understanding of celestial movement.

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There are total 5 number of conditions which are required in Hardy Weinberg Equilibrium to be established, of which no mutations, random mating and no natural selection, are given in the option.

Answer: A, B, F

Explanation:

To acquire the Hardy Weinberg equilibrium in the specified population, it must be kept in check for the random mating as given in the option. Other conditions are to have a large population which are free to mate and breed. Then there must be no allelic change in frequency as a result of mutation and mutation is allowed. The gene flow or the immigration of population or the emigration is not allowed. There must be no natural selection.  

Answer:

A. no mutations

B. random mating

F. no natural selection

Explanation:

Just did it

Answer:

steam at 110 degrees celsius

Explanation:

this is because the steam is at the highers temp

The particles move most rapidly in steam at 110°C. This is because steam represents water in its gaseous state, where the particles have the highest kinetic energy compared to the other options provided. The correct answer isc.

The particles in a substance move more rapidly as the temperature increases. Given the choices a. ice at -20 °C, b. water at 20 °C, c. steam at 110 °C, d. boiling water, and e. ice at 0 °C, the particles would move most rapidly in steam at 110 °C. This is because at higher temperatures, the particles gain kinetic energy and thus move faster.

Between solid ice and liquid water, the particles in the liquid water move faster, but not by as much as one might expect; there is only a 0.4% difference in average speed between ice at -1°C and water at 1°C. Therefore, steam at a temperature higher than boiling water will have the most rapidly moving particles among the options provided.

It can go through the all the states: solid, liquid, and gas.

On the ground, it is a liquid as water.  Then, it evaporates and becomes water vapor, a gas.  As it condensates, little droplets of vapor come together.  Then, it falls to the Earth as liquid water or frozen as solid snow/sleet/hail in precipitation.

Hope this helps!!

Final answer:

During the water cycle, water changes states from solid (ice and snow) to liquid (in bodies of water and clouds) to gas (water vapor) through processes like evaporation, condensation, and precipitation.

Explanation:

States of Matter in the Water Cycle

The water cycle involves water going through different states of matter: solid, liquid, and gas. Water in its solid state includes ice and snow. When energy is added to solid water, it melts into its liquid state, which is found in ground water, lakes, oceans, and clouds. As more heat is applied, water becomes a gas in the form of water vapor. This cycling involves several key processes, such as evaporation (liquid to gas), condensation (gas to liquid), precipitation (liquid to solid or liquid), and possibly sublimation (solid directly to gas).

Changing states within the water cycle are crucial as matter is recycled on Earth, allowing ecosystems to function properly. As heat is applied or removed, water transitions between these states, facilitating nutrient and energy flows vital for all living organisms. The processes mentioned above, like evaporation and condensation, are continuously happening all around the planet, enabling the water cycle to sustain life on Earth.

Take the stone's position at ground level to be the origin, and the downward direction to be negative. Then its position in the air [tex]y[/tex] at time [tex]t[/tex] is given by

[tex]y=100\,\mathrm m-\dfrac g2t^2[/tex]

Let [tex]d[/tex] be the depth of the well. The stone hits the bottom of the well after 5.00 s, so that

[tex]-d=100\,\mathrm m-\dfrac g2(5.00\,\mathrm s)^2\implies d=\boxed{22.6\,\mathrm m}[/tex]

Answer:

1. 8.0kg * m/s

2. The same as before the collision

3. The force will decrease

4. 14 m/s

The momentum before the collision and after the collision will be the same hat is 8 Kgm/s, and the club head slows down by 13.8 m/s after hitting the ball.

According to the law of conservation of momentum, the total momentum of a system before and after the collision must be the same.

Total Momentum = vector sum of (mass × velocity) of all the bodies

Mass of club head = 200g = 0.2kg

initial velocity of club head = 40 m/s

final velocity of the club head = v

mass of the ball = 46g = 0.046 kg

initial velocity of the ball = 0 m/s

final velocity of the ball = 60 m/s

Momentum before collision = 0.2 x 40 = 8 kgm/s

Now, by conservation of momnetum:

Momentum before collision = Momentum after the collision = 8 kgm/s

Momentum after the collision = momentum of the ball + momentum of the club head after the collision

8 = 0.046 x 60 + momentum of the club head after the collision

momentum of the club head after the collision = (8 - 2.76) kgm/s

momentum of the club head after the collision = 5.24  kgm/s

0.2 x v = 5.24

v = 5.24/0.2

v = 26.2 m/s is the final velocity of the club head.

the club head slows down by 40 - v = 40 - 26.2 = 13.8 m/s after hitting the ball.

if a manufacturer makes a golf ball that compresses more than a traditional golf ball when struck by a club the average force on the ball will decrease. Since force is defined as the rate of change of momentum. If the ball can be compressed more, it will take more time to transfer momentum to the ball, which will reduce the rate of change of momentum of the ball. Hence, the average force will decrease.

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Answer:

Most of the alpha particles passed through the gold foil without deflection, except for a small percentage.

Explanation:

Answer:

Most of the alpha particles passed through the gold foil without deflection, except for a small percentage.

Explanation:

 The Rutherford experiment throw some interesting results where the most particles passed the gold foil like they where in vacuum, but others particles dispersed with large angle even thought some of them bounce back.

 Rutherfor explain tis behavior assuming that the positive charge in an atom its concentrate in a region called nucleus, where this nucleus its very small compared with the size of the atom.

 The alpha particles used in the experiment where identified as a helium nucleus particles.

(a) 5310.7 V/m

The magnitude of the electric field between two parallel plates is given by

[tex]E=\frac{\sigma}{\epsilon_0}[/tex]

where

[tex]\sigma[/tex] is the surface charge density

[tex]\epsilon_0[/tex] is the vacuum permittivity

In this problem,

[tex]\sigma = 47.0 nC/m^2 = 47.0 \cdot 10^{-9} C/m^2[/tex]

So the electric field here is

[tex]E=\frac{47.0\cdot 10^{-9} C/m^2}{8.85\cdot 10^{-12}F/m}=5310.7 V/m[/tex]

(b) 116.8 V

The potential difference between the two plates is given by

[tex]V= Ed[/tex]

where

E is the magnitude of the electric field

d is the separation between the plates

Here we have

E = 5310.7 V/m

d = 2.20 cm = 0.022 m

So the potential difference is

[tex]V=(5310.7 V/m)(0.022m)=116.8 V[/tex]

(c) The electric field does not change

Explanation:

As stated in part (a), the magnitude of the electric field is given by

[tex]E=\frac{\sigma}{\epsilon_0}[/tex]

where

[tex]\sigma[/tex] is the surface charge density

[tex]\epsilon_0[/tex] is the vacuum permittivity

as we can see, the value of E depends only on the surface charge density, which is kept constant in this case, so the value of the electric field strength does not change.

(d) The potential difference doubles (233.6 V)

In this situation, the separation between the plates is doubled, so:

d' = 2 d

The potential difference depends linearly on the separation between the plates:

V = Ed

where

E is the magnitude of the electric field (which is kept constant)

d is the separation between the plates

So the new potential difference will be

[tex]V' = E(2d) = 2 (Ed) = 2 V[/tex]

which means that the potential difference will double:

[tex]V'=2 (116.8 V)=233.6 V[/tex]

Final answer:

The electric field between the plates is 5.31 x 10^3 N/C, and the potential difference is 116.82 V. Doubling the separation distance between the plates keeps the electric field the same, but doubles the potential difference.

Explanation:

For two large parallel conducting plates carrying opposite charges of equal magnitude separated by 2.20 cm with a surface charge density of 47.0 nC/m2, the magnitude of the electric field (Enfield) between the plates can be found using the formula E = σ / ε0, where σ is the surface charge density and ε0 is the permittivity of free space. Plugging the given values in, we find:
E = (47.0 × 10-9 C/m2) / (8.85 × 10-12 C2/N·m2)
= 5.31 × 103 N/C

The potential difference (V) between the plates is given by V = E × d, where d is the separation between the plates. Therefore:

V = (5.31 × 103 N/C) × (0.022 m)
= 116.82 V

If the separation between the plates is doubled while keeping the surface charge density constant, the magnitude of the electric field remains the same because it is dependent only on surface charge density, not distance. However, the potential difference will double because it is a product of electric field strength and the separation distance.

Answer:

D. +f

Explanation:

A lens works by refraction: it bends light rays as they pass through it so they change direction. A lens that can focus light is called a convex lens or converging lens, Light rays passes through the lens, refracts and are focused on a single point.

There's a simple measurement that tells you how powerful a lens is and it's known as the focal length. The focal length of a lens is the distance from the center of the lens to the point at which it focuses light rays. The shorter the focal length, the more powerful the lens.

+f means that the light rays coming from one side of a lens are focused on the other side of the lens at point F. In this case light can be focused.

-f means that the light rays coming from one side of a lens after being refracted through the lens appear to be diverging from a single point F' on the same side of the lens.

Answer: +f

Explanation:

Answer:

The electron

Explanation:

The atom consists of three subatomic particles:

- The proton: protons are inside the nucleus of the atoms, they have positive charge of +e ([tex]+1.6\cdot 10^{-19} C[/tex]), and a mass of approximately [tex]1.67\cdot 10^{-27} kg[/tex]

- The neutron: neutrons are also located inside the nucleus of the atoms, they have no electrical charge and mass similar to the mass of the proton

- The electron: electrons orbit around the nucleus in a cloud, they have negative charge of -e ([tex]-1.6\cdot 10^{-19} C[/tex]), and their mass is about 1800 time smaller than the mass of the proton ([tex]9.11\cdot 10^{-31} kg[/tex])

Answer: The structure of an Atom Quick Check

1. Which subatomic particle has a negative charge? Electron

2. The number of protons in one atom of an element is that element's... Atomic Number

3. Which statement about subatomic particles is NOT true? Protons and neutrons have the same charge.

4. How many neutrons are in the isotope carbon-14? 8

Explanation:

Answer:

204.1 Hz

Explanation:

The fundamental frequency of a vibrating string is given by:

[tex]f=\frac{1}{2L}\sqrt{\frac{T}{\mu}}[/tex]

where

L is the length of the string

T is the tension in the string

[tex]\mu[/tex] is the linear mass density of the string

For the wire in this problem, we have

L = 2.00 m

T = 8.00 kN = 8000 N

[tex]\mu = 12.0 g/m = 0.012 kg/m[/tex]

Therefore, substituting into the equation, we find the frequency of the string:

[tex]f=\frac{1}{2(2.00 m)}\sqrt{\frac{8000 N}{0.012 kg/m}}=204.1 Hz[/tex]

The frequency of the fundamental mode of vibration of the piano wire which is 2.00 meters long, has a linear mass density of 12.0 g/m and under a tension of 8.00 kilonewtons is approximately 257.247 Hz.

The fundamental frequency of vibration of the piano wire can be calculated using the formula for the frequency of a vibrating string:

f = 1/2L * sqrt(T/μ)

Where:

In this case, L = 2.00 m, T = 8.00 * 10^3 N (since 1 kilonewton equals 1,000 newtons), and μ = 0.012 kg/m. Hence, substituting these values gives:

f = 1/(2*2.00 m) * sqrt((8.00 * 10^3 N)/(0.012 kg/m))

After calculating, the frequency of the fundamental mode of vibration of this wire is found to be approximately 257.247 Hz.

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Phase changes in matter, such as an ice cube melting, are transitions between different forms of matter (solid, liquid, and gas) brought about by the addition or removal of heat. This alters the energy state of the substance and is influenced by the relative strengths of intermolecular attractions.

A phase change, as seen in the example of an ice cube melting, represents the transition of matter from one state to another. Phase changes include situations like melting (solid to liquid), vaporization (liquid to gas), and sublimation (solid to gas), all of which require an input of heat and are endothermic. Conversely, phase changes to a less energetic state, like condensation (gas to liquid) and freezing (liquid to solid), involve the removal of heat and are exothermic.

Such transitions are triggered either by adding or removing heat, which changes the energy state of the substance. The temperatures at which these transitions occur are reliant on the relative strengths of intermolecular attractions, which depend on the chemical identity of the substance in question. These transitions play an integral role in the study of heat flow and are crucial to our understanding of matter and energy.

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All phase changes are examples of physical changes.

True. An example of a phase change is an ice cube melting.

Phase change is the transition of a substance from one state of matter to another. The three primary states of matter are solid, liquid, and gas. All phase changes are examples of physical changes.

Melting is a phase change where a solid substance changes into a liquid state. When an ice cube melts, it changes from a solid to a liquid state, which is a physical change. The composition of the ice cube remains the same during this phase change.

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The complete question is below:

All phase changes are  ?  

An example of a phase change is an ice cube melting. true/false?

Answer:

A

Explanation:

v = 3*10^8

f = 4*10^18

wavelength = v/f

=3*10^8 / 4*10 ^18

=7.5*10^-11