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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
Sound cannot travel in vacuum.
Sound travels in air :
Complete the following sentences :
When sound travels in a medium, the particles of medium ___________ but the disturbance ___________.
A boy fires a gun and another boy at a distance hears the sound of fire 2.5s after seeing the flash. If the speed of sound in air 340 m/s, find distance between the boys.
Write the answer in your own words.
Explain with the help of practical examples how sound is propagated through solids.
Can sound propagate in solids and liquids?
Explain the effect of density on the speed of sound.
Can we hear sounds of frequencies:
More than 20 KHZ
Do all animals have same ranges of audible frequencies?
In any medium, as the ______ increases, the speed of sound also increases.
