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Electromagnetic Waves

JEE Main level, single correct, medium

52 of 165

Question 52 of 165

Which of the following are true?
A. Speed of light in vacuum is dependent on the direction of propagation.
B. Speed of light in a medium is independent of the wavelength of light.
C. The speed of light is independent of the motion of the source.
D. The speed of light in a medium is independent of intensity.
Choose the correct answer from the question given below :

Show answer and solution

Answer: (D) C and D only

Speed of light in vaccum is independent of the frequency, wavelength, nature of the source, direction of propagation, motion of the source and intensity of the wave. But it depends on the refractive index of the medium.
Therefore, the speed of light in vacuum is a universal constant.
Hence, C and D are only correct.

JEE Main question paper PDF

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JEE Main 2025 Apr 2 Shift 1 question paper

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JEE Main Physics practice question on Electromagnetic Waves (Electromagnetic Waves and Maxwell's equations), with the answer and a step-by-step solution. Scan a question from your own book or paper to get a whiteboard video.