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Home » Two monochromatic beams A and B of equal intensity I, hit a screen. The number of photons hitting the screen by beam A is twice that by beam B. Then what inference can you make about their frequencies?
Two monochromatic beams A and B of equal intensity I, hit a screen. The number of photons hitting the screen by beam A is twice that by beam B. Then what inference can you make about their frequencies?
CBSE | Class 12 | Dual Nature of Radiation and Matter | ncert exemplar | Physics
Two monochromatic beams A and B of equal intensity I, hit a screen. The number of photons hitting the screen by beam A is twice that by beam B. Then what inference can you make about their frequencies?

Let nA represent the number of photons that fall per second from beam A, and nB represent the number of photons that fall per second from beam B.

Given,

A has twice as many photons reaching the screen as B.

Therefore, nA = 2nB

Energy from the beam A = hvA

Energy from the beam B = hvB

Intensity = I = nAvA = nBvB

vB = 2vA

i

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