Question

Among the following four spectral regions, the photon has the highest energy in

• A. infrared
• B. violet
• C. red
• D. blue

Answer 1

Answer: (B)

Energy of photon $E=\frac{hc}{\lambda }$
where $h$ and $c$ are constant.
$\therefore E\propto \frac{1}{\lambda }$
As ${\lambda }_{\text{infra }}>{\lambda }_R>{\lambda }_B>{\lambda }_V$
Energy of photon will be maximum for violet colour.