1) Electrons on the surface of a metal can be ejected by shining light on them.
ID: 1582917 • Letter: 1
Question
1) Electrons on the surface of a metal can be ejected by shining light on them. However, a very bright red light source will not eject electrons, while even a very dim violet light source will eject electrons from the metal immediately. Why is this
2) Suppose you perform a double slit experiment with only a few hundred electrons. (a) Sketch what the pattern on the far screen would look like if electrons behaved purely like classical waves. (b) Sketch what the pattern on the far screen would look like if electrons behaved purely like classical particles. (c) Sketch what the pattern on the far screen actually looks like when this experiment is performed.
Explanation / Answer
(1) A very bright red light source will not eject electrons while a dim blue light will eject electrons because the red light frequency is not greater than the threshold frequency of the metal which is required to eject an electron.
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