Question

why cannot astronauts on the moon talk to ech other as they can on earth

Answer 1

Since there is no air or atmosphere in moon, sound particles cannot move as there is no medium to propagate. So that is why astronauts cannot talk to each other in space.

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Answer 2

they cannot talk to each other because there is vacuum present on the moon and we know that sound needs a medium to propagate so they are not able to talk with each other on the moon.

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