Astronauts communicate with one another on the moon with the help of.

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Radio waves

Sound waves

Ultrasound waves

Infrasound waves

answer is A.

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Detailed Solution

Concept: In the air, sound waves travel. However, there is no air in space, thus sound cannot travel there. Thus, the astronauts require certain equipment for communication purposes. These tools transform sound into a form that the astronauts can converse with. These gadgets are built on the idea of space-traveling waves.
In a vacuum or in outer space, sound cannot travel. However, electromagnetic waves such as light, radio, and other types of waves can travel through space. Therefore, during skywalking, astronauts use radio waves, one of the electromagnetic waves, to communicate with one another. There is fixed communication equipment in the astronauts' space suits. The gadgets come with speakers and a radio microphone. These microphones transform the sound being produced by the speaker into radio waves. In order for the other astronaut to hear, the speaker then transforms the radio wave into a sound wave. On the moon or at another location in space, astronauts communicate with one another in this way. The same tools are used by astronauts to communicate with those on Earth. The air in the space suit transforms these noises into radio waves.
As a result, radio waves are used by astronauts to communicate with one another on the moon.
Hence, the correct option is 1.

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