Question

The ratio of the energy of photon of 2000 Å wavelength radiation to that of 4000 Å radiation is

• A. 1/4
• B. 4
• C. 1/2
• D. 2

Answer 1

The correct option is D

2

$E=hv=h\frac{c}{\lambda }$ i.e. $E\propto \frac{1}{\lambda }$

$\frac{E_1}{E_2}=\frac{{\lambda }_2}{{\lambda }_1}=\frac{4000}{2000}=2$.