Q.
A photon of wavelength 6630 A0 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 its momentum without changing its magnitude