Question

The ratio of the energy of a photon with $\lambda =150nm$ to that with $\lambda =300nm$ is

• A. $2$
• B. $\frac{1}{4}$
• C. $4$
• D. $\frac{1}{2}$

Answer 1

The correct option is A

$2$

$E=\frac{hc}{\lambda }\Rightarrow \frac{E_1}{E_2}=\frac{300}{150}=\frac{2}{1}$