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प्रश्न
What are mechanical waves?
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उत्तर
Mechanical waves are those that result from the mutual exchange of kinetic and potential energy between mediums of particle vibrations.
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संबंधित प्रश्न
Define frequency 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.
Explain how the principle of echo is used by
The bat during its flight at
Explain how the principle of echo is used by
The dolphin to locate small fish as its prey
(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?
A sound wavelength of 0.332 m has a time period of 10−3 s. If the time period is decreased to 10−4 s, calculate the wavelength and frequency of the new wave.
What is meant by an echo? Explain.
