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प्रश्न
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उत्तर
The sound heard after reflection from a rigid obstacle (such as cliff, a hillside, a wall of a building, edge of a forest etc.), is called an echo.
Conditions necessary for echo formation are:
1. The minimum distance between the source of sound and its reflector should be 17 m.
2. Reflected sound should reach the person atleast 0.1 second after the original sound is heard.
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संबंधित प्रश्न
How is the frequency of a stretched string related to its length?
A certain sound has a frequency of 256 hertz and a wavelength of 1.3 m.
1) Calculate the speed with which this sound travels
2) What difference would be felt by a listener between the above sound and another sound traveling at the same speed, but of wavelength 2.6 m?
Name the characteristic of sound in relation to its waveform
A wave passes from one medium to another medium. Mention one property of the wave out of speed, frequency or wavelength which changes.
A wave passes from one medium to another medium. Mention one property of the wave out of speed, frequency or wavelength which does not change.
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.
What are mechanical waves?
Why is an echo not heard when the distance between the source of sound and reflection body is less than 10 m?
The direction of the incident sound, the direction of reflected sound, and the normal are in different Planes.
