## Module Question #32

MCalcagnie_ 1D
Posts: 55
Joined: Wed Sep 30, 2020 10:08 pm

### Module Question #32

Hi! I don't know why but I am stuck on question 32B on the Module Post-Assessment, it seems like we are only given one number and I don't know how to begin to solve, if someone could help that would be great!!

Posts: 73
Joined: Wed Sep 30, 2020 9:40 pm

### Re: Module Question #32

Which module are you referring to?

MCalcagnie_ 1D
Posts: 55
Joined: Wed Sep 30, 2020 10:08 pm

### Re: Module Question #32

Photoelectric Effect Module!

Posts: 73
Joined: Wed Sep 30, 2020 9:40 pm

### Re: Module Question #32

For #32, you use the information given in #31 as well, since it states that both problems refer to the same metal. In #31, it tells us that 3.607 x 10^-19 J is required to remove an electron from a metal surface, so this is our work function. In #32, it tells us that the kinetic energy is 4.200 x 10^-19 J. Now you can use the Ephoton-work function=Ek equation to find the energy of the photon. To find the wavelength, set the energy you found equal to hc/lambda (aka hv) and solve for lambda.

MCalcagnie_ 1D
Posts: 55
Joined: Wed Sep 30, 2020 10:08 pm

### Re: Module Question #32

Oh that's a lot clearer now! Thank you so much!