QJEEM23Ph4aaf: JEE Main 2023 Physics - Class 12 JEEM23Ph4aaf Solution: The energy of an electromagnetic wave contained in a small…

The energy of an electromagnetic wave contained in a small volume oscillates with double the frequency of the wave.

Here's why: The electromagnetic wave consists of oscillating electric and magnetic fields. The energy density of the wave is proportional to the square of the amplitude of these fields. Since the square of a sinusoidal function oscillates with twice the frequency of the original function, the energy density of the electromagnetic wave also oscillates with twice the frequency of the wave.