Which among the following statements is true?

Sound moves very slowly in the outer space.

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Intensity of sound gets reduced in the outer space.

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Shrillness of sound gets reduced in outer space.

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Sound cannot propagate in outer space.

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Solution

The correct option is D Sound cannot propagate in outer space.
Sound needs a medium to travel, but outer space has no atmosphere. Therefore sound cannot travel in outer space. This is the reason why people cannot talk to each other in vacuum.

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