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Q.

A photon of wavelength 6630 Å is incident on a totally reflecting surface. The momentum delivered by the photon is equal to

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a

6.63 x 10–27 kg-m/sec

b

2 x 10–27 kg-m/sec

c

10–27 kg-m/sec

d

None of these

answer is B.

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Detailed Solution

The momentum of the incident radiation is given as  . When the light is totally reflected normal to the surface the direction of the ray is reversed. That means it reverses the direction of it’s momentum without changing it’s magnitude
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