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प्रश्न
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उत्तर
The sound heard after reflection from a rigid obstacle is called an echo. To hear the cho of a sound distinctly, the reflecting surface in air should be at a minimum distance of 17 m from the listener.
If the distance is less than 17 m, the reflected sound will reach the ears before the original sound dies out. In such a case, the original sound mixes up with the reflected sound. Due to repeated reflections at the reflecting surface, the sound gets prolonged. This effect is known as reverberation.
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संबंधित प्रश्न
What do you mean by reflection of sound? State one condition for the reflection of a sound wave. Name a device in which reflection of sound wave is used.
Define the term Frequency (as applied to sound waves)
Write the approximate value of the speed of sound in water.
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.
Name the type of waves that are used for sound ranging. Why are radio waves not audible to us?
In what respect does waveforms of noise and a musical note differ. Draw diagrams to illustrate your answer.
(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?
