Question

why can two astronauts not hear each other while talking to each other on moon?
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Answer 1

MY DEAR HERE IS YOUR ANSWER

Because there is no atmosphere at moon. ... On earth sound travels through air. Due to absence of air on moon,sound cannot travel so astronauts cannot hear each other.

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Answer 2

As we know that sound needs medium to travel and we also know that in space there is no air particles hence, there is no medium for sound... Hence we can't hear each other on moon.