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प्रश्न
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.
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संबंधित प्रश्न
Define amplitude term in relation to a wave.
Define frequency term in relation to a wave.
Define wavelength term in relation to a wave.
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.
State two factors on which the speed of a wave travelling in a medium depends.
Name the waves which are used in sonar to find the depth of a sea. Give one reason for their use.
What is a bulb horn ? Name the principle on which a bulb horn works.
Explain how the principle of echo is used by
The bat during its flight at
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.
Why will an echo not be heard when the distance between the source of the sound and the reflecting surface is 10 m?
