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A parallel beam of electrons , travellin...

A parallel beam of electrons , travelling in x - direction , falls on a slit of width d (see the figure) . If after passing the slit, an electron acquires momentum `P_y` in the y direction, then for a majority of electrons passing through the slit , (h is Planck's constant)

A

`|P_y|dgth`

B

`|P_y|dgtgth`

C

`|P_y|dlth`

D

`|P_y|d~=h`

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The correct Answer is:
A
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