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प्रश्न
What are infrasonic waves?
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उत्तर
The waves of frequency below 20 Hz are called infrasonic waves.
संबंधित प्रश्न
How is the frequency of a stretched string related to its length?
The following diagram shows three ways in which the string of an instrument can vibrate.
(a) which of the diagram shows the principal note?
(b) which has the frequency four times that of the first?
(c) what is the ratio of the frequency of the vibration in (i) and (ii)?
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.
State two factors on which the natural frequency of a body depends.
(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.
