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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.
Name one solid, on liquid and one gas through which sound can travel.
When we open a gas tap of a few seconds, the sound of escaping gas is heard first but the smell of gas comes later. Why?
Fill in the blank with suitable word.
Sound cannot travel through ____________.
Describe in brief, with the aid of a lebelled diagram, an experiment to demonstrate that a material medium is necessary for propagation of sound.
The time interval between a lightning flash and the first sound of thunder was found to be 5 s. If the speed of sound in air is 330 m s-1, find the distance of flash from the observer.
Assuming the speed of sound in air equal to 340 m/s and in water equal to 1360 m/s, find the time taken to travel a distance 1700 m by sound in (i) air (ii) water.
______ is the distance between two consecutive particles.
______ is the number of vibrations of a particle in the medium, in one second
The small to and fro motion is called vibration.
