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Question

A photon of wavelength 4400˚A is passing through vacuum. The effective mass and momentum of the photon are respectively?

A
5×1036 kg, 1.5×1027kgm/s
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B
5×1025 kg, 1.5×1026kgm/s
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C
Zero, 1.5×1026 kgm/s
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D
5×1036 kg, 1.36×1043 kgm/s
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Solution

The correct option is B 5×1036 kg, 1.5×1027kgm/s
We know
λ=h/mv
m=h/λv
=6.626×10344400×1010×3×108
=5×1036Kg
Momentum =mv=5×1036×3×108=1.5×1027kgm/s

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