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प्रश्न
State the use of echo by a bat, dolphin and fisherman.
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उत्तर
Bats, dolphin and fisherman detect their enemies or obstacles or position of fish by emitting/sending the ultrasonic waves and hearing/detecting the echo.
संबंधित प्रश्न
Define wave velocity term in relation to a wave.
State two factors on which the speed of a wave travelling in a medium depends.
What adjustments would you make for tuning a stringed instrument for it to emit a note of a desired frequency?
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?
(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?
What is mean by the reflection of sound?
Explain reflection at the boundary of a rarer medium.
