Page 1 of 1

### Photoelectric Experiment - Chem Test 2

Posted: Fri Nov 02, 2018 10:37 am
4. In an X-ray photoelectron experiment, lead metal is irradiated with X-ray light.
Part A: The intensity of ejected electrons is plotted as a function of their velocity, as shown in the graph below. Calculate the total kinetic energy in 5 mol of ejected electrons.

What does it mean by “5 mol of ejected electrons”? How do we find the mol of ejected electrons? Also, when using the E(k) equation for this problem, is the mass that we plug in the mass of Pb or the mass of the electron?

### Re: Photoelectric Experiment - Chem Test 2

Posted: Fri Nov 02, 2018 11:29 am
To find 5 moles of ejected electron, you would multiply your answer by plancks constant and multiply that by 5.

### Re: Photoelectric Experiment - Chem Test 2

Posted: Fri Nov 02, 2018 6:07 pm
You would use the mass of the electron in the Ek equation since it is an electron being ejected, not a lead atom.

### Re: Photoelectric Experiment - Chem Test 2

Posted: Fri Nov 02, 2018 6:39 pm
Was the kinetic energy 5.5x^10^6?