Photoelectric EffectMedium

Question

Number of photons of equal energy emitted per second by a 6 mW laser source operating at 663 nm is $\_\_\_\_$ .

(Given : $h = 6.63 \times 10^{- 34}$ J.s and $c = 3 \times 10^{8}\text{ }m/s$ )

Options

A.$5 \times 10^{16}$
B.$5 \times 10^{15}$
C.$10 \times 10^{15}$
D.$2 \times 10^{16}$

Solution

$P = \frac{nhC}{\lambda}$

$$6 \times 10^{- 3} = \frac{n \times 6.63 \times 10^{- 34} \times 3 \times 10^{8}}{663 \times 10^{- 9}} $$$n = 2 \times 10^{16}$ photons

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