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Photoelectric Effect Module Question 28

Posted: Sun Oct 13, 2019 2:43 pm
by Juliet Stephenson 4E
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!

Re: Photoelectric Effect Module Question 28

Posted: Sun Oct 13, 2019 2:51 pm
by Ashley R 1A
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

Re: Photoelectric Effect Module Question 28

Posted: Sun Oct 13, 2019 2:52 pm
by Juliet Stephenson 4E
Thank you Ashley!