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प्रश्न
Name two sound absorbing materials (or objects) which can make our big room less echoey.
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उत्तर
Curtains and carpets are two sound-absorbing materials that can make big rooms less echoey.
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संबंधित प्रश्न
The displacement distance graph of two sound waves A and B, travelling in a medium, are as shown in the diagram below.
Study the two sound waves and compare their:
- Amplitudes
- Wavelengths
How do bats avoid obstacles in their way, when in flight?
The following diagram shows three ways in which the string of an instrument can vibrate.
(a) which of the diagram shows the principal note?
(b) which has the frequency four times that of the first?
(c) what is the ratio of the frequency of the vibration in (i) and (ii)?
Explain how is the principle of echo used by
(a) The bat during its flight at night,
(b) The dolphin to locate small fish as its prey.
Mention two properties of a wave, one property which varies and the other which remains constant when the wave passes from one medium to another.
Why is an echo not heard when the distance between the source of sound and reflection body is less than 10 m?
What is meant by an echo? Explain.
