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प्रश्न
Why do astronauts talk to each other through radio telephone in space?
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उत्तर
Sound can not travel through vacuum. There is no material medium in the space for propagation of sound. Hence astronauts talk to each other through radio telephone in space. In radio telephone, message of one astronauts reach to the other with the help of radio waves, which can travel through vacuum.
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संबंधित प्रश्न
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