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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
Name the characteristic of sound in relation to its waveform
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 principle on which a soundboard works.
What is a bulb horn ? Name the principle on which a bulb horn works.
Draw a labelled diagram to show the multiple reflections of sound in a part of the stethoscope tube.
A cork piece is floating on the surface of the water in a pond. A piece of pebble is dropped into the water. What will be your observation?
(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?
Write short notes on reflection of sound waves from plane and curved surfaces.
