JEE Main 2023 — Electromagnetic Waves Question with Solution
From: JEE Main 2023 (Online) 10th April Morning Shift
Question
The energy of an electromagnetic wave contained in a small volume oscillates with
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Show full solutionCorrect option: A
Step-by-step explanation
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.
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This is a previous-year question from JEE Main 2023, covering the Electromagnetic Waves chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.