Monochromatic light of frequency is produced by a laser. The power emitted is . How many photons per second, on an average, are emitted by the source?

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Solution

Q.
Monochromatic light of frequency $6 \times 10^{14} H z$ is produced by a laser. The power emitted is $2 \times 10^{- 3} W$ . How many photons per second, on an average, are emitted by the source [2024]

(Given $h = 6.63 \times 10^{- 34}$ Js)

1 $9 \times 10^{18}$

2 $6 \times 10^{15}$

3 $5 \times 10^{15}$

4 $7 \times 10^{16}$

Ans.
(3)

$Power P = 2 \times 10^{- 3} W$

$Energy E = h ν = 6.63 \times 10^{- 34} \times 6 \times 10^{14}$

$∴ n = \frac{P}{E} = \frac{2 \times 10^{- 3}}{6.63 \times 10^{- 34} \times 6 \times 10^{14}}$

$n = 5 \times 10^{15}$

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