Q. The momentum of a photon of energy in , will be

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Solution:

Energy of photon is given by
...(i)
Where is the Planck's constant, c the velocity of light and its wavelength.
wavelength of the photon is given by

where is being momentum of the photon.
From Equations (i) and (ii), we get

Or
Given,

Hence, after putting numerical values, we obtain