Sam's father and mother are astronauts. Last month they returned from a tour to moon. Sam's father told him that they had air filled helmet and it also had microphone, which they used for talking to each other. But his mother was not able to listen to him when they opened their helmets. (Assume they were wearing oxygen masks when they opened their helmets). What is the reason?

There is no atmosphere on the moon. Sound needs a medium to travel and since there is no air, sound cannot travel. So his mother was not able to listen to his father

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