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प्रश्न
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उत्तर
Bats make a series of twittering sound, so high pitched that human ear can not hear. These sound waves strike against the obstacles less in their path of flight and send back echoes to the bat’s ear. The echoes tell the bats, how they must turn in the air to avoid colliding with the obstacles or with one another.
संबंधित प्रश्न
A person is listening to a tone of 500 Hz sitting at a distance of 450 m from the source of the sound. What is the time interval between successive compressions from the source?
Write true or false for a given statement.
Waveforms of two different stringed instruments can be the same.
Fill in the blank.
The pitch of a sound depends on its ________.
Fill in the blank.
________ produces a sensation in ears.
Define time period.
How does a bat make use of ultrasonics waves to find its way?
Name the two types of waves which can be generates in a long flexible spring (or slinky).
What is the difference between a compression and a rarefaction in a sound wave? Illustrate your answer with a sketch.
Give two examples each of longitudinal waves and transverse waves.
Which of the following can produce longitudinal waves as well as transverse waves under different conditions?
Answer the following question :
Can sound travel in vacuum?
The heart of a man beats 75 times a minute. What is its (a) frequency and (b) time period?
Select the correct option:
In the region of compression or rarefaction, in a longitudinal wave, the physical quantity which does not change is:
Explain how the principle of echo is used by
The dolphin to locate small fish as its prey.
Waves created by Earth Quake are Infrasonic.
Why does an empty vessel produce more sound than a filled one?
The sound produced by a thunderstorm is heard 10 s after the lightning is seen. Calculate the approximate distance of the thunder cloud. (Given the speed of sound = 340 m s–1.)
What are the uses of infrasonic sound?
Why is a sound wave called a longitudinal wave?
