Quantum physics

#1
Hello, I was just wondering , if the stoping potential is negative, do we take it into account ?
Say we are finding the work function and the stopping potential is -1.2v, is it hf -(-1.2) e = work function?Or hf - 1.2(e) = work function?

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8 years ago
#2
(Original post by Sweet Rose)
Hello, I was just wondering , if the stoping potential is negative, do we take it into account ?
Say we are finding the work function and the stopping potential is -1.2v, is it hf -(-1.2) e = work function?Or hf - 1.2(e) = work function?

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It doesn't matter. The stopping potential for an electron in the photoelectric effect is always going to be negative.
For the purpose of calculation of the work function it's just the magnitude of the stopping potential that is important. It gives you the magnitude of the value of the maximum kinetic energy of the emitted electrons in the equation. This is positive, and so is the value of hf. So the work function is then also positive. The photoelectric equation is really only dealing in three amounts of energy. As such they are all positive.
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#3
(Original post by Stonebridge)
It doesn't matter. The stopping potential for an electron in the photoelectric effect is always going to be negative.
For the purpose of calculation of the work function it's just the magnitude of the stopping potential that is important. It gives you the magnitude of the value of the maximum kinetic energy of the emitted electrons in the equation. This is positive, and so is the value of hf. So the work function is then also positive. The photoelectric equation is really only dealing in three amounts of energy. As such they are all positive.
Thank you!! 😊

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