Achieve Question #4

[Stephanie Torres 2F]

Hello!

I've done this question multiple times and continue to get the same wrong answer.

I have to find the number of photons given wavelength.(8.61 x 10^-4)

First, I converted wavelength to meters. (0.00000861)
Then I plugged it into the equation E=hc/lambda which gives me 9.60 x 10^-20, but it is wrong.

Can anyone help me?

Thank you ahead of time.

[Kyle_Phong_2J]

Hi Stephanie,

I don't have the same Achieve #4 as you, but I will try to help based on the information that you've given. What is the unit for wavelength? Also, the equation E = hc/lambda solves for the energy per photon, but it sounds like the question is asking for the number of photons. If they gave you a certain number of J for heat that the photons would need to absorb, you could divide this value by the E you calculated from the previous equation to get the number of photons.

Hopefully this helps!

[Stephanie Torres 2F]

Thank you! It worked :)