Sapling HW #1

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Sarina Mak 1B
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Joined: Wed Sep 30, 2020 9:31 pm

Sapling HW #1

Postby Sarina Mak 1B » Sun Nov 01, 2020 1:40 pm

I don't understand the solution to the question. What is the wavelength, frequency, and energy of a pulse containing 100 of these photons? I assumed 100 photons means the energy of photons is 100E, and I thought the the energy and frequency were proportional, so I thought the frequency is also 100. Can someone explain why it is only 1 wavelength, 1 frequency, and 100 E?

Lakshmi Davuluri 1E
Posts: 90
Joined: Wed Sep 30, 2020 9:50 pm

Re: Sapling HW #1

Postby Lakshmi Davuluri 1E » Sun Nov 01, 2020 1:56 pm

When talking about the wavelength and frequency, it is referring to one photon because all of the photons in the pulse have the same wavelength and frequency. The energy is multiplied by 100 because there are 100 photons with the same wavelength and frequency. If you look at the equation, E=hv, frequency is proportional to the energy, but the energy in this equation is per photon. Your frequency is not going to change based on the number of photons. Hope this helps :)

Gwendolyn Hill 2F
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Re: Sapling HW #1

Postby Gwendolyn Hill 2F » Sun Nov 01, 2020 1:59 pm

wavelength and frequency do not change based on the number of photons there are, but 100 photons of energy E creates 100E, at that SAME wavelength and frequency :) Proportionality doesn't matter here, it's just kind of a check for understanding about how photons work.

Sarina Mak 1B
Posts: 23
Joined: Wed Sep 30, 2020 9:31 pm

Re: Sapling HW #1

Postby Sarina Mak 1B » Sun Nov 01, 2020 2:05 pm

Thanks for explaining! I understand the question more now.

abby hyman
Posts: 93
Joined: Thu Jul 25, 2019 12:16 am

Re: Sapling HW #1

Postby abby hyman » Sun Nov 01, 2020 2:08 pm

As they stated above, the wavelength and frequency do not change based on the number of photons. The value you get for energy is per photon so you must only multiply this value by 100 to get the total energy.

Irene Nguyen 2J
Posts: 50
Joined: Wed Sep 30, 2020 9:44 pm

Re: Sapling HW #1

Postby Irene Nguyen 2J » Sun Nov 01, 2020 4:49 pm

As everyone else mentioned, frequency and wavelength are proportional to each other but does not change according to the amount of photons as they all have the same value for frequency and wavelength. Energy in this context refers to each photon, so the energy for 100 photons would be 100E.

Ansh Patel 2I
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Joined: Wed Sep 30, 2020 9:42 pm

Re: Sapling HW #1

Postby Ansh Patel 2I » Sun Nov 01, 2020 5:07 pm

Hi! Although frequency and wavelength are proportional to each other, increasing the number of photons (increasing intensity) does not have any effect on these two values. Since each photon has the same energy, 100E represents this notion for 100 photons.


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