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  • How many photons are emitted per second by a  laser source operating at <img alt="632

How many photons are emitted per second by a 5 \mathrm{~mw} laser source operating at 632.8 \mathrm{~nm} ?
 

Option: 1

1.6 \times 10^{16}


Option: 2

1.8 \times 10^{14}


Option: 3

1.9 \times 10^{20}


Option: 4

1.6 \times 10^{17}


Answers (1)

best_answer

The energy of each photon
\begin{aligned} &\mathrm{E=\frac{h c}{\lambda}}\\ &\mathrm{ E=\frac{\left(6.63 \times 10^{-34}\right) \times\left(3 \times 10^8\right)}{632.8 \times 10^{-9}} }\\ &\mathrm{ E=3.14 \times 10^{-19} \mathrm{~J}} \end{aligned}

The number of photons emitted per second is given by -

\begin{aligned} &\mathrm{ n=\frac{\text { Power }}{E} }\\ &\mathrm{ n=\frac{5 \times 10^{-3}}{3.14 \times 10^{-19}} }\\ &\mathrm{ n=\frac{500}{314} \times 10^{16}=1.6 \times 10^{16} }\\ \end{aligned}

Posted by

Divya Prakash Singh

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