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An astronaut can’t hear his companion at the surface of the moon because:
A. Produced frequencies are above the audio frequency
B. There is no medium for sound propagation
C. Temperature is too low during the night and too high during the day.
D. There are too many craters on the surface of the moon

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Hint: Here we have to apply the concepts of sound propagation. Also we have carefully observed each and every option.
Sound is a signal that propagates through a propagation medium, such as gas, liquid or solid.

Complete step by step answer:
Sound travelling is considered the transmission of sound.
The to and fro motion of the medium’s particles is how sound propagates.
The objects surrounding the medium vibrate as an object vibrates.
The particle in contact with the vibrating particle is displaced from its location of equilibrium first.
The other particle in touch is disrupted by each particle. The disturbance is thus brought to the listener from the source.
It is impossible for sound to travel in vacuum.
Often temperature is a factor that influences the speed of sound. Heat is a source of kinetic energy like sound. Molecules have more energy at higher temperatures. So they are able to vibrate faster. Because the molecules vibrate more rapidly, sound waves can move further.
We know that there is no gravity in space. This very phenomenon helps the astronauts to float around in space. The gravitational pull is stronger only near earth. The further we get away from earth the less is the gravity. Since, there is no gravitational pull, so, there is no medium present in the atmosphere. As we all know sound needs a medium to propagate. So, astronauts cannot hear each other while in space.
Hence, option B is correct.

Note:A vacuum is a place where there is no air. As there is no medium for the sound particles in vacuum, sound cannot travel without air.
Last updated date: 24th May 2023
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