Question

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

• A. 1/4
• B. 4
• C. 1/2
• D. 2

Answer 1

The correct option is D

2

${\lambda }_1=2000A^{\circ }{\lambda }_2=4000A^{\circ }\frac{E_1}{E_2}=\frac{{\lambda }_2}{{\lambda }_1}\frac{E_1}{E_2}=\frac{4000A^{\circ }}{2000A^{\circ }}=2:1$