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Question

Calculate the mass of a photon with wavelength 3.6˚A.


A

9.1×1029kg

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B

8×1029kg

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C

7× 1027kg

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D

6.1×1029kg

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Solution

The correct option is D

6.1×1029kg


Here,λ=3.6×1010m

We know , de-Broglie wavelength

λ = hp λ = hmv m= hλv

Now,

λ=3.6 ˚A=3.6× 1010m

Velocity of photon = Velocity of light

m=hλv = 6.626×1034Js1(3.6×1010m)(3×108ms1)

=6.135×1029kg


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