First slide

Quantum Theory of Light

Question

A laser beam of output power ‘P’ consists only of wavelength $λ$ . If Planck’s constant is h and the speed of light is c, then the number of photons emitted per second is

Moderate

A

P $λ$ /hc
B

P $λ$ /h
C

hc/P $λ$
D

hc $λ$

Solution

energy of each photon if n photons are coming per second then power P= $\frac{n h c}{λ}$
n= $\frac{P λ}{h c}$

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