Jamb 1979
Which one of the following types of waves cannot travel through a vacuum? A. sound waves B. light waves C. infra-red waves D. X-radiation E. radio waves.
ANSWER: Option A
EXPLANATION: Sound is a mechanical wave and a mechanical wave is a wave that requires a material medium to propagate.
Vacuum is an empty space that has no particles that can serve as a means of propagation for the sound wave.
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