### Photoelectric Effect Module

Posted:

**Mon Oct 15, 2018 10:06 pm**I had a question about one of the parts of the Photoelectric Effect Module Post Assessment.

Question 30 specifically. The given information is as follows:

Light hits a sodium metal surface and the velocity of the ejected electron is 6.61 x m/s. The work function for sodium is 150.6 kJ/mol.

The question asks for the frequency of the incident light on the sodium metal surface. So I began by solving for the energy of the incoming light by adding the work function to the energy of the emitted electron (answered in a previous question as 1.99 x J. Once I had that energy calculation I used Planck's equation to solve for frequency and got 2.27 x Hz. Which was a multiple choice answer that was wrong.

I'm not sure how to properly solve this question and would appreciate any help! Thank you!

Question 30 specifically. The given information is as follows:

Light hits a sodium metal surface and the velocity of the ejected electron is 6.61 x m/s. The work function for sodium is 150.6 kJ/mol.

The question asks for the frequency of the incident light on the sodium metal surface. So I began by solving for the energy of the incoming light by adding the work function to the energy of the emitted electron (answered in a previous question as 1.99 x J. Once I had that energy calculation I used Planck's equation to solve for frequency and got 2.27 x Hz. Which was a multiple choice answer that was wrong.

I'm not sure how to properly solve this question and would appreciate any help! Thank you!