A radiation of energy E falls normally on a perfectly reflecting surface. The momentum transferred to the surface is: - Physics MCQ AIEEE 2004 2026 | ExamTest.live | ExamTest.live

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A radiation of energy E falls normally on a perfectly reflecting surface. The momentum transferred to the surface is:

A $E / c$
B $2 E / c$
C $E c$
D $E / c^{2}$

Solution & Step-by-step Explanation

Momentum of a photon is p = E / c .Initial momentum p_{i} = E / c (towards the surface).Final momentum after perfect reflection p_{f} = - E / c (away from the surface).Momentum transferred to the surface Δ p = p_{i} - p_{f} : Δ p = \frac{E}{c} - (- \frac{E}{c}) = \frac{2 E}{c}

Practice this question

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A radiation of energy E falls normally on a perfectly reflecting surface. The momentum transferred to the surface is:

A

E / c

B

2 E / c

C

E c

D

E / c^{2}

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