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Question

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).
306920_6398122fc3954c8ea27ef1b59002fc45.png
  1. |Py|d<h
  2. |Py|dh
  3. |Py|d>h
  4. |Py|d>>h

A
|Py|d<h
B
|Py|d>>h
C
|Py|dh
D
|Py|d>h
Solution
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From Heisenberg's uncertainty principle, ΔpΔyh

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