- #1
ghostbuster25
- 102
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Ok guys got a question on quantum physics - photoelectric effect i want to run past you before i attempt a solution.
The question is as follows;
In a photoelectric-effect experiment, light of wavelength 420nm is incident on a sample of sodium. The work function of sodium is 3.67*10-19 J.
Calculate the stopping potential required to stop all electrons from reaching the anode.
I don't really know where to start as I am not completely sure on what the question is asking for.
I know how to work out the maximum kinetic energy of the ejected electrons by way of hf-work funtion, but i KNOW this isn't the way to approach it.
Any ideas or suggestions?
The question is as follows;
In a photoelectric-effect experiment, light of wavelength 420nm is incident on a sample of sodium. The work function of sodium is 3.67*10-19 J.
Calculate the stopping potential required to stop all electrons from reaching the anode.
I don't really know where to start as I am not completely sure on what the question is asking for.
I know how to work out the maximum kinetic energy of the ejected electrons by way of hf-work funtion, but i KNOW this isn't the way to approach it.
Any ideas or suggestions?