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प्रश्न
How do bats avoid obstacles in their way, when in flight?
उत्तर
Bats can produce and detect the sound of very high frequency up to about 1000kHz. The sounds produced by flying bats get reflected back from any obstacle in front of it. By hearing the echoes, bats come to know even in the dark where the obstacles are. So they can fly safely without colliding with the obstacles.
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संबंधित प्रश्न
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 changes.
State two factors on which the speed of a wave travelling in a medium depends.
What is the condition necessary for an echo to be heard distinctly?
Draw a labelled diagram to show the multiple reflections of sound in a part of the stethoscope tube.
Why will an echo not be heard when the distance between the source of the sound and the reflecting surface is 10 m?
(i) A man stands at a distance of 68 m from a cliff and fires a gun. After what time interval will he hear the echo, if the speed of sound in air is 340 ms−1?
(ii) If the man had been standing at a distance of 12 m from the cliff would he have heard a clear echo?
Explain Reflection at curved surfaces.
Write short notes on reflection of sound waves from plane and curved surfaces.
