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Photoelectric emission

PostPosted: June 30th, 2009, 1:17 am
by college-textbooks
This is a question regarding photoelectric emission when I study Griffiths'
Introduction to Quantum Mechanics ... ition.html

When frequency of the radiation increases at a constant intensity, the number of electrons emitted per unit time decreases. Why is that so?

p.s. I need an answer ample for Alevel purposes. Not too complex that is.