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Question

The momentum of a photon of wavelength 0.01 A0 is
  1. 6.6×1032kg m/s
  2. 6.6×1020kg m/s
  3. 6.6×1022kg m/s
  4. 6.6×1012kg m/s

A
6.6×1022kg m/s
B
6.6×1012kg m/s
C
6.6×1032kg m/s
D
6.6×1020kg m/s
Solution
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de Broglie wavelength λ=hp
Thus momentum of the photon p=hλ
where wavelength of the photon λ=0.01×1010m
p=6.6×10340.01×1010
p=6.6×1022kg m/s
So, the answer is option (C).

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