WBCS.LIVE practice question
The velocity of light is maximum in
Solve this multiple-choice question and check the correct answer with its explanation below.
Answer options
Correct answer and explanation
Correct answer: vacuum
Explanation: ā Correct Answer: C) vacuum š Explanation: Light travels at its maximum possible speed limit of approximately 300,000 kilometers per second ($3 \times 10^8 \text{ m/s}$) when moving through a vacuum. A vacuum provides zero material resistance to electromagnetic waves. When light enters medium layers like water, glass, or diamond, its velocity decreases due to the higher refractive index of those substances. Vacuum remains the absolute cosmic speed constant.