allerySound CANNOT travel through:
AWater
BAir
CVacuum
DSteel
Answer & Solution
Correct answer: C. Vacuum
Sound is a vibration of particles of a medium.
A vacuum has no particles to vibrate, so sound cannot propagate through it.
Astronauts on a spacewalk cannot hear each other through the vacuum of space — they communicate via radio (electromagnetic waves, which need no medium).
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