NEET Physics EM Spectrum MCQ Question
Which of the following statements about electromagnetic waves is correct?
Electromagnetic waves can only be produced by oscillating electric charges.
Electromagnetic waves require a medium to propagate.
Electromagnetic waves consist of oscillating electric and magnetic fields that are perpendicular to each other.
The speed of electromagnetic waves varies based on their frequency.
Correct Answer
Detailed Explanation
Electromagnetic waves consist of oscillating electric and magnetic fields that are perpendicular to each other, as described in the properties of electromagnetic waves. They do not require a medium for propagation (Option B is incorrect), and while they are produced by oscillating charges, they can also be generated by time-varying fields (making Option A misleading). The speed of electromagnetic waves in a vacuum is constant, independent of their frequency (thus Option D is incorrect).
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