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प्रश्न
Why cannot a sound be heard on the moon? How do astronauts talk to one another on the surface of moon?
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उत्तर
Sound cannot be heard on the surface of moon because there is no air on the moon to carry the sound waves. Hence, sound waves cannot be propagated in vacuum.
Astronauts talk to one another on the surface of moon through wireless sets that uses radio waves. This is because radio waves can travel through vacuum, whereas sound waves cannot travel through vacuum as they require material medium for their propagation.
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संबंधित प्रश्न
Fill in the blank.
Sound requires a ________ for propagation.
Out of solids, liquids and gases :
(a) in which medium sound travels slowest?
(b) in which medium sound travels fastest?
Sound travels in air :
Fill in the blank and explain.
Sound does not travel through ______.
Describe an experiment to prove that a material medium is necessary for the propagation of sound.
What is the approximate value of the speed of sound in air at N.T.P.?
Can we hear sounds of frequencies:
Less than 20 Hz
______ is the distance between two consecutive particles.
In any medium, as the ______ increases, the speed of sound also increases.
The small to and fro motion is called vibration.
