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Q.

A monochromatic light of frequency $6 \times 10^{14} Hz$ is produced by a laser. The power emitted is 2mW. The rate of emision of photons on an average is

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a

$2 \times 10^{15} / \sec$

b

$5 \times 10^{15} / \sec$

c

$2 \times 10^{14} / \sec$

d

$3.5 \times 10^{14} / \sec$

answer is D.

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Detailed Solution

$P = \frac{N h ν}{t}$

$\Rightarrow \frac{N}{t} = \frac{2 \times 10^{- 3}}{6.6 \times 10^{- 34} \times 6 \times 10^{14}} = 5 \times 10^{15} s^{- 1}$

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