Kamala made a table to describe parts of the electromagnetic spectrum.



What mistake did Kamala make?

Gamma rays should have a very high frequency, not a very low frequency.
Visible light should have a low frequency and a long wavelength.
Infrared light should have a short wavelength, not a long wavelength.
Microwaves should have a high frequency and a short wavelength.

When oxygen reacts with sodium, the electrons move from the sodium atoms to the oxygen atoms which is denoted as option B.

This is referred to as electrovalent bonding and usually occurs between a metal and non metal.

The metal in this scenario is Sodium which loses electron to the non metal which is oxygen to become positively charged.

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Final answer:

To determine the average number of neutrons in an element, subtract the atomic number from the atomic mass listed on the periodic table. For elements with no stable isotopes, the number in square brackets is used for the most stable isotope. Note that the atomic mass is the average mass reflecting the mixture of isotopes found in nature.

Explanation:

To determine the average number of neutrons in an element using the periodic table, you can look at two quantities for each element: the atomic number and the atomic mass. The atomic number, which is the whole number listed with the element, represents the number of protons in the nucleus. The atomic mass (or mass number) is listed with a decimal and represents the average mass of all the isotopes of that element, taking into account the natural abundance of each isotope. It is effectively the average number of protons and neutrons combined.

To calculate the average number of neutrons, you would subtract the atomic number from the atomic mass. For elements with no stable isotopes (such as technetium, promethium, polonium, and those higher than atomic number 84), the mass number in square brackets indicates the mass of the most stable (often hypothetical) isotope. It is important to note that the atomic mass on the periodic table is usually not a whole number because it accounts for the average atomic mass of the naturally occurring isotopes.

Answer:

a. molecules become lighter when heated

Reason:

Hot air balloons rise because the heated air inside the balloon is less dense than the cool air outside. This difference in density creates a buoyant force that causes the balloon to rise. The increase in temperature causes the molecules in the gas to move faster and spread apart, further decreasing the density and increasing the buoyancy.

Hot air balloons rise because the molecules in the heated air are less dense compared to the surrounding cool air. This decrease in density creates a buoyant force that causes the balloon to rise. As the temperature of the gas inside the balloon increases, the molecules move faster and farther apart, resulting in a decrease in density and an increase in buoyancy. The expansion of gases and the rapid motion of atoms and molecules in a gas also contribute to the balloon's ability to rise.

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Horizontal component of force is used to find out the work done

[tex]W = Fdcos\theta[/tex]

so we can say the work done as

[tex]W = (Fcos\theta)d[/tex]

so here the vertical component of force is not used to find out the work done

so here it would be

[tex]F_y = Fsin\theta[/tex]

[tex]F_y = 245sin55[/tex]

[tex]F_y = 200.7 N[/tex]

so 200.7 N is not used to find out work done

Filtration is the process we can use here as distillation is done mostly in liquids and we can use distillation here to seperate the substances from the soil.

Answer:

Filtration

Explanation:

Hi, to have in mind:

The filtration is a physical process used to separate two or more components due to their different size of particule (or unit).

The destilation is a chemical process used to separate two or more componets due to the difference between their boiling points (usually used with liquids).

Being that said, by filtration you can separate the leaves, acorns and twigs from the soil.

Answer:

B. Spring

Explanation:

The waters of a lake will be the most layered in the spring because of the melting of the ice (which is just frozen water) and the direct heat going into the lake causing the warm water to rise up and the colder water to move further down, which creates even more layers.

Answer:

4.9 meters

Explanation:

We know that an 11 lb bowling bowl was dropped.

So we can say that the initial speed of the bowling ball is zero ,

the time taken by the bag to free fall is given as  t = 1.0 s; and

the acceleration of free fall is given as  a = 9.8 m/s[tex]^2[/tex].

So we will use the following equation to find the distance after falling fo 1 sec:

[tex]d=v_i*t+\frac{1}{2} at^2[/tex]

Substituting the given values to get:

[tex]d=0+\frac{1}{2} * 9.8 * 1^2[/tex]

[tex]d=4.9[/tex]

Therefore, the bowling ball will cover a distance of 4.9 meters when released from the top of the building.

4 times the mass of Earth . . . multiplies Earth gravity by 4

1/2 of Earth's radius . . . multiplies Earth's gravity by 4

both changes . . . multiplies Earth gravity by (4 x 4) = 16

The acceleration of gravity on the surface of Planet-X is 16 TIMES that on the Earth's surface ... about 6.3 times what it is on Jupiter.

You could not walk around on Planet-X, and it's pretty likely that whatever contraption you landed in could not take off again.  You're stuck on Planet-X, living out the short remainder of your life just laying there like a heavy pancake and using all of your strength just trying to breathe.  It won't be pretty.

1. The magnitude of the magnetic field doubles

Explanation: the intensity of the magnetic field produced by a current-carrying wire is given by:

[tex]I=\frac{\mu_0 I}{2 \pi r}[/tex]

where [tex]\mu_0[/tex] is the vacuum permeability, I is the current in the wire, r is the distance from the wire.

As we see from the formula, the intensity of the magnetic field is directly proportional to the current: if the current increases from 5 A to 10 A, it means it doubles, so the magnetic field doubles as well.

2. The magnitude of the magnetic field halves

Explanation: the intensity of the magnetic field produced by a current-carrying wire is given by:

[tex]I=\frac{\mu_0 I}{2 \pi r}[/tex]

We see that the magnitude of the magnetic field is inversely proportional to the distance from the wire (r). In this case, the distance of the particle is changed from 10 cm to 20 cm, so it is doubled: therefore, the magnitude of the field will become half of the initial value.

3. The force reverses direction

Explanation: the force exerted on a charged particle in a magnetic field is:

[tex]F=qvB sin \theta[/tex]

where q is the charge, v is the speed of the particle, B is the magnetic field intensity and [tex]\theta[/tex] the angle between the direction of v and B. If the charge of the particle is switched from 2 µC to –2µC, the magnitude of the force does not change (because the absolute value of q does not change), however the charge q gets a negative sign (-), so the sign of the force changes and gets a negative sign too, so the force reverses direction.

(a) When the current increases from 5 A to 10 A, the strength of the magnetic field increases.

(b) When the distance  from the wire increases, the strength of the magnetic field decreases.

(c) When the sign of the charge changes and the magnitude is the same, the strength of the magnetic force will remain the same.

The magnetic field due to a distance from a wire is given as follows;

[tex]B = \frac{\mu_o I}{2\pi r}[/tex]

where;

Thus, when the current increases from 5 A to 10 A, the strength of the magnetic field increases.

Also, when the distance  from the wire increases, the strength of the magnetic field decreases.

The magnetic force on a charged particle moving in a magnetic field is given as;

F = qvB

where;

The magnetic force considers the magnitude of the charge, thus when the sign of the charge changes and the magnitude is the same, the strength of the magnetic force will remain the same.

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The answer is periosteum. Hope this helps!

The periosteum is the thin, dense membrane that covers the outer layer of bones, providing nourishment and playing a key role in bone growth, repair, and remodeling, excluding areas where bones form joints.

The thin, dense membrane that covers the outer layer surface of the bone is called the periosteum. This membrane is vitally important as it contains blood vessels, nerves, and lymphatic vessels that nourish the compact bone beneath it. Notably, the periosteum connects to the bone with strong collagen fibers known as Sharpey's fibers, which are integral in the attachment of tendons and ligaments. Although it covers most of the bone's surface, the periosteum does not cover the areas where bones form joints; these areas are protected by a different type of tissue. The function of the periosteum is not only protective; it also plays a crucial role in bone growth, repair, and remodeling due to its layer of bone-forming cells.

A spinning disk with 130 rev/min will make 33.5833 revolutions in 31 seconds.

Initial angular velocity,

wi = 2π. f

Where, f - frequency = 130 rev/min = 13/6 rev/s

Thus,

wi = 2π × 13/6

wi = 13π/3 rads/s

Final  angular velocity,

wf = 0 rads/s = wi + at

From acceleration,

a = -wi/t

Where,

a - acceleration

t - time = 31s

So,

t = -13π/3 × 1/31

t = -13π/93 rads/s²

From relation between Tangential velocity and Angular velocity,

wf² - wi² = 2a∅

Where, ∅ is the Tangential velocity

Thus,

-169π²/9 rads²/s² = 2 × -13π/93 rads/s² × ∅

∅ = 1209π/18 rads

Thus, the the number of rotations,

n = ∅/2π

n = (1209π/18)/(2π)

n = 1209/36

n  = ≈ 33.5833 revolutions.

Therefore, the disc make 33.5833 revolutions in 31 seconds.

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Answer: d

Explanation:

For an object to move in a uniform circular motion, only force that acts on it is the centripetal force which acts along the line joining the object and center of the circular path. The acceleration also acts in the direction of force. The centripetal acceleration acts along the radius of the circular motion path.

In the given horizontal circle, the direction of the acceleration of the object points towards d.

Answer:

D.

Explanation:

Answer: 23 electrons.

Explanation: an atom have equal number of protons and electrons.

The second statement is the correct choice.  Don't make me type it out.

transparent --> translucent --> opaque

A. Is the correct answer

Answer:

A is the correct answer :)))

Explanation:

D. Atoms.

Explanation:

All the matter is made of elementary particles called "atoms".

Further, an atom is made of electrons, protons and neutrons. The electrons & protons are again made of the fundamental sub-particles, electrons (leptons) and the protons(quarks).

The classification of particles is shown in the figure attached

D. Atoms.

Because different kinds of atom have different number of protons, neutrons, and electrons.

The height of the cliff from which the ball was dropped from is 224.4m.

Given the data in the question;

To get the height of the Cliff, we use the Second Equation of Motion:

[tex]s = ut + \frac{1}{2}at^2[/tex]

Where s is the distance or height, [tex]u[/tex] is the initial velocity, t is the time and a is the acceleration. Since the ball was thrown down from a certain height (cliff), its is now under the influence of gravity. acceleration due to gravity; [tex]g = 9.8m/s^2[/tex]

Hence, the equation becomes

[tex]s = ut + \frac{1}{2}gt^2[/tex]

We substitute the given values into the equation

[tex]s = ( 8m/s\ *\ 6s) + (\frac{1}{2}\ *\ 9.8m/s^2\ *\ (6s)^2)\\\\ s = ( 48m ) + (4.9m/s^2\ *\ 36s^2)\\\\ s = ( 48m ) + (4176.4m)\\\\ s = 224.4m[/tex]

Therefore, the height of the cliff from which the ball was dropped from is 224.4m

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Answer: C. illuminance of a surface.

a)  Incandescence:  The phenomenon of light emission by a body as a result of high temperature.

B. Luminous flux :  It is the quantity of the energy of the light emitted per second in all directions.

C. Illuminance of a surface :describes the quantity of light emitted by a light source or received at a surface.

D. luminous intensity : the quantity of visible light that a point source radiates in a given direction.

The answer is B.one plate slides beneath another due to gravitational pull.

Answer:

Its B

Explanation:

took the test 2020

g≈10 m/s²

F=G=mg=65*10=650 N

L=F*h=650*7=4550 J

P=L/t=>t=L/P=4550/300=15.16 s

Thrust force due to ejection of water on the cart is counter balanced by spring force on the cart

so we can write

[tex]F_t = v \frac{dm}{dt}[/tex]

here we have

[tex]\frac{dm}{dt}[/tex] = rate of mass ejection

[tex]\frac{dm}{dt} = \rho a\frac{dx}{dt} = \rho a v[/tex]

now from above formula

[tex]F_t = \rho a v(v) = \rho av^2[/tex]

Now by force balance equation

[tex]F_t = F_s[/tex]

[tex]\rho a v^2 = kx[/tex]

by rearranging the terms now

[tex]v= \sqrt{\frac{kx}{\rho a}}[/tex]

Answer:

B) The final acceleration will triple between the first and third trial.

Explanation:

From the relationship (acceleration) = (force) / (mass) it follows that the acceleration is directly proportional to the force applied. During the second experiment the acceleration will double (as force doubles), and during the third it will be tripled compared to the first.

according to newton's second law , net force on an object is the product of mass of the object and the acceleration of the object. the formula is given as

F = ma               where F = net force , m = mass and a = acceleration

so acceleration can be given as

a = F/m

for same net force , the acceleration depends on the mass of the object .

greater the mass , smaller will be the acceleration and vice versa.

Since the mass of electron is smaller as compared to the mass of proton, hence the electron will accelerate more as compared to proton.

A) The electron will accelerate more than the proton

A) the electron will accelerate more than the proton.

If the net force is greater than one, SOOO Newton’s second law of motion, an object will accelerate. The mass is inversely proportional to the acceleration. The lower the mass, the faster the acceleration,

hope this helps! :)

Answer:

12.3 years

Explanation:

The equation of the radioactive decay can be written as follows:

[tex]\frac{N(t)}{N_0}=(\frac{1}{2})^{\frac{t}{\tau_{1/2}}}[/tex] (1)

where

N(t) is the amount of radioactive sample left at time t

N0 is the amount of radioactive sample at time t=0

t is the time passed

[tex]\tau_{1/2}[/tex] is the half-life of the isotope

The problem tells us that after t=36.9 y, the amount of sample which has become stable is 7/8. This means that 7/8 of the sample has already decayed, so the amount of radioactive sample left is

[tex]\frac{N(t)}{N_0}=1-\frac{7}{8}=\frac{1}{8}[/tex]

We can now re-arrange equation (1) by using this information and by substituting t=36.9 y we find:

[tex]\frac{t}{\tau_{1/2}}=log_{1/2} (\frac{N(t))}{N_0})\\\tau_{1/2}=\frac{t}{log_{1/2}(\frac{N(t)}{N_0})}=\frac{36.9 y}{log_{1/2}(1/8)}=\frac{36.9 y}{3}=12.3 y[/tex]

So, the answer is

12.3 years

Answer:

A. 12.3 years

Explanation:

Answer:

5.7 m/s^2

Explanation:

First of all, we need to calculate the resultant force on the crate. We have:

- A force of +210 N in the positive direction

- The frictional force of -74 N in the opposite direction

So, the resultant force is

F = 210 N - 74 N= 136 N

So now we can apply Newton's second law to find the acceleration:

[tex]F=ma[/tex]

where m=24 kg is the mass of the crate. Re-arranging the equation, we get:

[tex]a=\frac{F}{m}=\frac{136 N}{24 kg}=5.7 m/s^2[/tex]

Answer:

 Option B is the correct answer.

Explanation:

 We have expression for sound intensity level,

                  [tex]L=10log_{10}\frac{I}{I_0}[/tex], where I is the intensity.

Here new intensity is given by 4I.

So, increase in  sound intensity level

        [tex]\delta L=10log_{10}\frac{4I}{I_0}-10log_{10}\frac{I}{I_0}=10log_{10}\frac{4I}{I}=6dB[/tex]

So, option B is the correct answer.

Because they have added another solution, it means that the mixture was not yet saturated, so the correct answer is unsaturated, D

Answer:  D) unsaturated

Explanation:

A) Saturated solution is defined as the solution in which no more solute particles can be dissolved in the solvent.

B) Semisaturated is defined as the solution in which half of the amount has been added and  another half has to be added for saturation.

C) Supersaturated solution is defined as the solution in which more amount of solute particles is present than the solvent particles.

D) Unsaturated solution is defined as the solution in which more solute particles can be dissolved in the solvent.

Answer:

She is measuring her speed

Explanation:

Speed is defined as the ratio between the distance covered divided by the time taken to cover that distance:

[tex]v=\frac{d}{t}[/tex]

where

d is the distance covered

t is the time taken

Since Mary is measuring how far she can run in a given period of time, she is measuring the distance she can travel (d) in a given time (t), so she is measuring her speed.

Sometimes, because acceleration due to gravity on Earth depends on how close you are to the Earth's center.