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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
Calculate the wavelength of a sound wave whose frequency is 220 Hz and speed is 440 m/s in a given medium.
Fill in the blank.
The pitch of a sound depends on its ________.
Name the two characteristics of sound which differentiate two sounds from each other.
Name the characteristic which differentiates two sounds of the same pitch and same loudness.
Describe an experiment to show the production of sound having low and high pitch.
Why are musical instruments provided with more than one string ?
Why are the waves mentioned by you not audible to us?
A stone is dropped on the surface of water in a pond. Name the type of waves produced.
What type of waves are illustrated by the movement of a rope whose one end is fixed to a pole and the other end is moved up and down?
How does the frequency of sound given by a stretched string depend on its
- length,
- tension?
Select the correct option:
Which of the following is an elastic wave?
How is sound produced?
Is sound a form of energy?
Explain how the principle of echo is used by
The bat during its flight at night
High-frequency sounds that cannot be heard by you are called _______.
How does the sound produced by a vibrating object in a medium reach your ears?
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.)
Sound cannot travel through ______.
Why is a sound wave called a longitudinal wave?
The speed of sound in air at 0°C is ______.
