First slide

Quantum Theory of Light

Question

Two different monochromatic beams of same intensity hit a screen. If number of photons hitting the screen by beam A is twice than by B. Then f_A: f_B is

Moderate

A

1 :1
B

2:1
C

1:2
D

3:2

Solution

Intensity is energy incident per unit area per unit time. As the intensities are same and A is emitting double the photons than B for the same energy that means B should be having double the frequency than A.
$f_{A} : f_{B} = 1 : 2$

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