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Echoes and Vibrations of Sound — Physics STD 10 — Question

ICSE BoardEnglish MediumSTD 10PhysicsEchoes and Vibrations of Sound2 Marks
Question
Two astronauts cannot hear each other on the moon. Why?
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Answer

Material medium is necessary for the propagation of sound. On the moon there is a vacuum, i.e. no air, therefore sound cannot propagate on the moon. Thus the astronauts can not hear each other.

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