## intensity vs energy

asalest 2K
Posts: 52
Joined: Wed Sep 30, 2020 9:39 pm

### intensity vs energy

can some explain this true or false question please with the answer:

An increase in intensity means an increase in energy

Abby Lam 3F
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Joined: Wed Sep 30, 2020 9:46 pm

### Re: intensity vs energy

I think this is false. An increase in intensity means you increase the number of photons. You do not increase the individual energy of each photon by increasing intensity. To increase the energy of each photon, I believe you would increase frequency.

Tessa House 3A
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### Re: intensity vs energy

I believe that when talking about the photoelectric experiment or light, increasing the intensity does increase the overall energy of all the photons combined because it increases the number of photons. However, increasing the intensity of light does not increase the energy of each individual photon, which must be done by increasing frequency or decreasing wavelength. This is because increasing intensity increases the number of photons, but not the energy of each photon.

KhanTran3K
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Joined: Wed Sep 30, 2020 9:31 pm

### Re: intensity vs energy

Hey!
The intensity of light relates to the amount of photons, but does not have an impact on the overall energy. Like what Tessa said, the photoelectric effect showed how intensity had no effect on the ejection of electrons, but rather the frequency did. Depending on what electrons we are trying to eject (ie what metal surface) this frequency varies, but it must reach this frequency threshold in order to eject any electrons. This shows how energy is related to frequency and wavelength rather than intensity of light. Hope that helped!

Posts: 55
Joined: Wed Sep 30, 2020 9:49 pm

### Re: intensity vs energy

Like everyone said, this is false. I was confused about this too, but from what I gathered, a higher intensity doesn't increase the energy, it just increases the number of photons. The photoelectric effects states that if the energy of the photon is greater or equal to the energy to remove an electron, then an increase in light intensity will result in more ejected electrons. I hope this helps!

Marianna_Shand_3H
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Joined: Thu Oct 08, 2020 12:16 am

### Re: intensity vs energy

I believe it is false as an increase in frequency means an increase in energy.

Gigi Elizarraras 2C
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Joined: Wed Sep 30, 2020 9:41 pm

### Re: intensity vs energy

This statement is FALSE. An increase in intensity will lead to an increase in the number of photons emitted and therefore an increase in the number of electrons affected(1 photon: 1 electron). But the number of electrons affected will not contribute to the total amount of energy, as frequency is the way to increase ENERGY PER PHOTON and get the electrons to actually jump to other energy levels:)

Katie Lam 2J
Posts: 57
Joined: Wed Sep 30, 2020 9:35 pm

### Re: intensity vs energy

I believe this is false. An increase in intensity would increase the number of particles at a time. An increase in energy has to do with an increase in frequency.

Becca Nelson 3F
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Joined: Wed Sep 30, 2020 9:52 pm

### Re: intensity vs energy

This statement is False. The way I determined this is through the E=hv equation. An increase in intensity does not increase the energy of the photon as it does not change the constant h or increase the the value of v.

Tanya Nguyen 1B
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Joined: Wed Sep 30, 2020 9:33 pm

### Re: intensity vs energy

It would be false because each photon/electron has a certain amount of energy, increasing the intensity just means that you are increasing the number of photons which increases the number of electrons with the same amount of energy.

Mackenzie Stockton 2H
Posts: 57
Joined: Wed Sep 30, 2020 10:11 pm

### Re: intensity vs energy

I went to a UA session about this, and the statement technically depends on whether light is acting like a wave or a particle. If light is acting like a particle, increasing intensity increases the amplitude of the wave, so it would increase energy. If light is acting like a wave, increasing intensity just increases the number of photons and not the energy.

Will Skinner
Posts: 49
Joined: Wed Sep 30, 2020 9:28 pm

### Re: intensity vs energy

If we are thinking of light in photons, the light is quantized. This means that each photon has a discrete amount of energy. Increasing the intensity means that there is a greater number of photons, but the energy of each photon remains the same. The answer to that question, then, would be false.

Posts: 53
Joined: Wed Sep 30, 2020 9:33 pm

### Re: intensity vs energy

An increase in intensity is an increase in particles, while an increase in energy is an increase in frequency. Think of it as more intense = throwing more balls at a target.

DPatel_2L
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Joined: Wed Sep 30, 2020 9:41 pm

### Re: intensity vs energy

False because and increase in frequency means and increase in energy.

Joel Meza 3I
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Joined: Wed Sep 30, 2020 9:56 pm

### Re: intensity vs energy

An increase in intensity does not relate to an increase in energy of a photon. Intensity only relates to the number of photons, not the energy each photon has. It is the frequency of a photon that determines its energy.

josephspindler2H
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Joined: Wed Sep 30, 2020 9:54 pm

### Re: intensity vs energy

As many have already discussed, this statement is decidedly false. When we go to the quantum level, the level of one photon, the energy will not increase. This is because increasing intensity increases the number of photons of light, rather than the individual energy of each photon. More photons does not translate to more energy per photon as Dr. Lavelle discussed in lecture.

Gustavo_Chavez_1K
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Joined: Wed Sep 30, 2020 9:46 pm

### Re: intensity vs energy

The statement is false as an increase in intensity is not associated to an increase in the energy of a photon. By increasing intensity, the only thing changing is the number of photons of light and not the energy of each individual photon. In order to increase the energy of a photon one would have to increase the frequency of the light.

Jonathan Banh 1G
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Joined: Wed Sep 30, 2020 9:33 pm

### Re: intensity vs energy

This statement should be false. An increase in intensity implies an increase in the overall amount of photons present, not directly affecting the individual energy that each photon possesses. In order to increase the individual energy levels, you would need to alter the frequency.

Jeremy Wei 2C
Posts: 53
Joined: Wed Sep 30, 2020 9:59 pm

### Re: intensity vs energy

Hi, personally I think this statement is false as it doesn’t take into account the different views on light. On the quantum view, increasing the intensity does not increase the energy of the individual protons (you’d have to increase frequency in order to do that)

joshtully
Posts: 56
Joined: Wed Sep 30, 2020 9:36 pm

### Re: intensity vs energy

This is false, because frequency and energy increase simultaneously.

Anastasia Yulo 1C
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Joined: Wed Sep 30, 2020 9:47 pm

### Re: intensity vs energy

The intensity of light is dependent on the amount of photons. However the intensity does not determine on the overall energy.
The photoelectric effect shows that frquency has effect on the ejection of electrons.

Karina Grover 1A
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### Re: intensity vs energy

The answer is false. Intensity and energy do not have a relationship, and they are therefore not directly proportional to one another. Energy and frequency are related, however.

Dane_Beasley_1E
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Joined: Wed Sep 30, 2020 9:42 pm

### Re: intensity vs energy

The answer is false because increasing intensity increases the number of photons. Energy only increases when frequency increases.

Arnav Saud 2C
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Joined: Wed Sep 30, 2020 9:51 pm

### Re: intensity vs energy

The answer is false because you have to increase the frequency in order to increase the energy of the photons. Increasing the intensity means that the number of photons that are emitted is increase.

David Liu 1E
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Joined: Wed Sep 30, 2020 10:07 pm

### Re: intensity vs energy

it should be false because intensity is based on how many photons there are, while energy is focused on the individual photon!

tholz11
Posts: 54
Joined: Wed Sep 30, 2020 9:38 pm

### Re: intensity vs energy

I believe this statement is false because when light acts as a wave, intensity has nothing to do with the actual energy, only the number of photons involved. (Think about E=hv, v has nothing to do with the number of photons, just the frequency of the photons.)

105618850
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Joined: Wed Sep 30, 2020 9:38 pm

### Re: intensity vs energy

I agree with everyone else. An increase in energy results in an increase in frequency, not necessarily intensity which I believe concerns the amount of photons.

CesarLec1
Posts: 67
Joined: Wed Sep 30, 2020 9:49 pm

### Re: intensity vs energy

Energy and frequency are directly related while energy and intensity are not related as intensity only deals with the number of photos so it is a false statement.

Jeremy Wei 2C
Posts: 53
Joined: Wed Sep 30, 2020 9:59 pm

### Re: intensity vs energy

This should be false, because on the quantum level an increase in intensity means an increase in the number of photons, while an increase in energy increases the actual energy of each photon itself. Hope this helps!

505612629
Posts: 44
Joined: Wed Sep 30, 2020 9:43 pm

### Re: intensity vs energy

hi! I believe an increase in intensity increases the number of photons by terms of the photoelectric effect and will emit more electrons but it doesn't effect the energy.