Question

If the wavelength of incident radiation is $248\text{nm}$, calculate the momentum associated with the photon.

• A. $2.67\times {10}^{-27}\text{kg-m/s}$
• B. $5.4\times {10}^{-25}\text{kg-m/s}$
• C. $5.4\times {10}^{-28}\text{kg-m/s}$
• D. $2.67\times {10}^{-24}\text{kg-m/s}$

Answer 1

The correct option is A $2.67\times {10}^{-27}\text{kg-m/s}$

Momentum $P=\frac{h}{\lambda }$
$=\frac{6.63\times {10}^{34}}{248\times {10}^{-9}}=2.67\times {10}^{-27}\text{kg-m/s}$

Hence, $\left(A\right)$ is the correct answer.

$\begin{array}{c}\text{Why this question?}\\ \text{A typical formula based question, momentum of a photon}P=\frac{h}{\lambda }\end{array}$