Question: Q. 8. Monochromatic light of frequency $6.0 \times 10^{14} \mathrm{~Hz}$ is produced by a laser. What is the energy of a photon in the light beam?
R [SQP 2018-19]
$$ \begin{align*} & \text {
Solution:
Ans. Each photon has an energy, } E=h v \ & \quad=\left(6.63 \times 10^{-34} \mathrm{~J}-\mathrm{s}\right)\left(6.0 \times 10^{14} \mathrm{~Hz}\right) \ & \quad=3.98 \times 10^{-19} \mathrm{~J} \end{align*} $$
[CBSE Marking Scheme 2018]
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