Question

The ratio of the energy of photon of $2000\mathring{A}$ wavelength radiation to that of $4000$ A radiation is

• A. $1/4$
• B. $4$
• C. $1/2$
• D. $2$

Answer 1

Answer: (D)

$E=hv$ and $\Delta E=\frac{hc}{\lambda }$
$\frac{E_1}{E_2}=\frac{{\lambda }_2}{{\lambda }_1}=\frac{4000}{2000}=2$