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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
Is the speed of sound more in water or in steel?
In which medium sound travels faster : air or iron?
Describe an experiment to show that sound cannot pass through vacuum.
The sound waves travel fastest :
Give scientific reasons:
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State three characteristics of the medium required for propagation of sound?
Compare approximately the speed of sound in air, water and steel.
How long will sound take to travel in (a) and iron rail and (b) air, both 3.3 km in length? Take speed of sound in air to be 330 m/s and in iron to be 5280 m/s.
Can sound propagate in solids and liquids?
What is the audible range of frequency?
