Astronauts on the surface of the moon cannot hear each other's voice through air because:
ATheir helmets block all incoming sound waves
BThe moon has no atmosphere, no medium for sound
CTheir voices are too soft for the conditions of the moon
DLight travels faster than sound on the moon's surface
Answer & Solution
Correct answer: B. The moon has no atmosphere, no medium for sound
Sound needs a material medium (gas, liquid, or solid) to propagate. The moon has no atmosphere, so no air molecules to carry compressions/rarefactions. Hence no sound transmission in air.
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