Photoelectric Effect Module Question 28

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Juliet Stephenson 4E
Posts: 100
Joined: Wed Sep 18, 2019 12:21 am

Photoelectric Effect Module Question 28

Postby Juliet Stephenson 4E » Sun Oct 13, 2019 2:43 pm

Hi, I was hoping someone could walk me through Problem 28 on the Photoelectric Module.

28. Light hits a sodium metal surface and the velocity of the ejected electron is 6.61 x 105 m.s-1. The work function for sodium is 150.6 kJ.mol-1.
Answer the following three questions.
A. What is the kinetic energy of the ejected electron?
C. What is the frequency of the incident light on the sodium metal surface?

Thank you!

Ashley R 1A
Posts: 41
Joined: Sat Aug 24, 2019 12:16 am

Re: Photoelectric Effect Module Question 28

Postby Ashley R 1A » Sun Oct 13, 2019 2:51 pm

I posted about this question the other day haha :) For part a), you use the e=1/2 m v^2 equation since e = kinetic energy of the electron. You're given velocity, and then the mass of an electron is constant at 9.109 x 10^-31 kg. Then, now that you have e, you can use the equation e = hv to calculate the frequency, since your only unknown is v

Juliet Stephenson 4E
Posts: 100
Joined: Wed Sep 18, 2019 12:21 am

Re: Photoelectric Effect Module Question 28

Postby Juliet Stephenson 4E » Sun Oct 13, 2019 2:52 pm

Thank you Ashley!


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