STANDARD Physics Properties of Electromagnetic Waves MCQ Question
Which one of the following is the property of a monochromatic, plane electromagnetic wave in free space?
Electric and magnetic fields have a phase difference of π/2.
The energy contribution of both electric and magnetic fields are equal.
The direction of propagation is in the direction of B × E.
The pressure exerted by the wave is the product of its speed and energy density.
Correct Answer
Detailed Explanation
In electromagnetic waves, electric and magnetic fields are in phase. Electromagnetic waves carry energy as they travel through space, and this energy is shared equally by electric and magnetic fields. The direction of the propagation of electromagnetic waves is in the direction of E × B. The pressure exerted by the wave is equal to its energy density.
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