A parallel beam of electrons travelling in x-direction falls on a slit of width d. If after passing the slit, an electron acquires momentum py in the y direction, then for a majority of electrons passing through the slit (h is Planck's constant).
|Py|d<h
|Py|d≃h
|Py|d>h
|Py|d>>h
A
|Py|d<h
B
|Py|d>>h
C
|Py|d≃h
D
|Py|d>h
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Solution
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From Heisenberg's uncertainty principle, ΔpΔy≥h
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