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प्रश्न
How is sound perceived by us?
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उत्तर
Sound requires a material medium for its propagation. It is produced when a body vibrates. The vibrations produced at a point are transmitted in the medium (air) from one point to the next and so on in the form of mechanical waves which produce compressions and rarefactions in air. These compressions and rarefactions produce vibrations in the eardrum which are perceived by us as sound.
संबंधित प्रश्न
Which characteristics of the sound helps you to identify your friend by his voice while sitting with others in a dark room?
Differentiate between a high pitch sound and a low pitch sound.
When we change a feeble sound to a loud sound, we increase its :
Complete the following sentences :
Wave velocity = ________________ × wavelength.
Name the factors on which the speed of sound depends.
What type of sound is produced by elephants and whales?
Match the following.
| Ultrasonics | Frequency below 20Hz |
| Speed of sound in air | Needs material medium |
| Infrasonics | 330ms-1 |
| Sound propagation | Frequency more than 20000 Hz |
What are the uses of infrasonic sound?
Distinguish between compression and rarefactions.
