An astronaut cannot hear his companion at the surface of the moon because:

An astronaut cannot hear his companion at the surface of the moon because:

A
produced frequencies are above the audio frequencies
B
there is no medium for sound propagation
C
temperature is too low during night and high during day
D
there are too many craters on the surface of the moon

Solution:

Since there is no atmosphere on moon, hence sound waves cannot travel there.

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