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प्रश्न
How are bats able to avoid obstacles in their way?
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उत्तर
Bats emit the high frequencies that range between 20 KHz to 75 KHz. The echoes from these sounds help in locating the obstacles in their path and to avoid them.
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संबंधित प्रश्न
Out of solids, liquids and gases :
(a) in which medium sound travels slowest?
(b) in which medium sound travels fastest?
In which medium sound travels faster : air or hydrogen?
Which of the following terms apply to sound waves in air and which to water waves?
Transverse, Rarefaction, Trough, Crest, Compression, Longitudinal
Explain why, a ringing bell suspended in a vacuum chamber cannot be heard outside.
Describe an experiment to show that sound cannot pass through vacuum.
Flash of lightning reaches earlier than the sound of thunder. Explain the reason.
The time interval between a lightning flash and the first sound of thunder was found to be 5 s. If the speed of sound in air is 330 m s-1, find the distance of flash from the observer.
Describe an experiment to prove that a material medium is necessary for the propagation of sound.
What is the approximate value of the speed of sound in air at N.T.P.?
What is the audible range of frequency?
