Which of the following waves have smallest velocity in vacuum?
Correct answer: B. Sound
- A. Ultraviolet
- B. Sound
- C. Infra-Red
- D. Micro
Explanation
Sound cannot propagate through a vacuum because it needs a material medium, so it has no meaningful velocity there. Ultraviolet, infrared, and microwaves are electromagnetic waves and all travel at the same speed in vacuum.
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