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Q.

The momentum of a photon in an X-ray beam of $10^{- 10}$ metre wavelength is

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a

$6 .6 \times 10^{- 44} kg - m / \sec$

b

$2 .2 \times 10^{- 52} kg - m / \sec$

c

$6 .6 \times 10^{- 24} kg - m / \sec$

d

$1 .5 \times 10^{- 23} kg - m / \sec$

answer is B.

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Detailed Solution

Momentum of photon

$p = \frac{h}{λ} = \frac{6.6 \times 10^{- 34}}{10^{- 10}} = 6 .6 \times 10^{- 24} kg - m / \sec$

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