Question

A photon of wavelength of 4.5 Aº. Calculate its mass.
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Answer 1

Answer:

m = 0.490 x 10^-32 kg.

Explanation:

We know that, from de'Broglie wave equation

λ = h/mv (c is considered for photon)

Hence, Mass of photon = h/cλ

where h = 6.626 x 10^-34

c = 3.0 X 10^ m/s.

given,

λ = 4.5 x 10^ -10 m

Substituting the above values in the mass of photon equation,

we get ,

Mass of photon (m) = 6.626 x 10^-34 / (4.5 x 10^-10 x 3 x 10^10)

m = (6.626/13.5)x10^-32 kg

ie. m = 0.490 x 10^-32 kg.

Hope this answers your question.