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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
Write true or false for a given statement.
Sound can only be produced by vibrating bodies.
Fill in the blank.
________ produces a sensation in ears.
Which wave property determines pitch?
What change do you expect in the characteristics of a musical sound if
(i) Its frequency is increased,
(ii) Its amplitude is increased?
Draw a displacement-distance graph of a wave and mark on it, the amplitude of wave by the letter 'a' and wavelength of wave by the letter λ.
Describe a simple experiment to determine the speed of sound in air. What approximation is made in the method described by you?
Complete the following sentences :
Wave velocity = ________________ × wavelength.
The separation between two consecutive crests in a transverse wave is 100 m. If wave velocity is 20 m s-1, find the frequency of wave.
Select the correct option:
If the frequency of a wave is 25 Hz. the total number of compressions and rarefactions passing through a point in 1 second is :
What kinds of waves are produced in solids, liquids, and gases?
What cause sound? Why do we require a material medium for the transmission of sound?
Sound waves travel very fast in
The sound waves are reflected from an obstacle into the same medium from which they were incident. Which of the following changes?
A key of a mechanical piano struck gently and then struck again but much harder this time. In the second case
Which of the following statements are correct?
- Sound is produced by vibrations.
- Sound requires a medium for propagation.
- Light and sound both require a medium for propagation.
- Sound travels slower than light.
Name two musical instruments which produce sound by vibrating strings.
Why is a sound wave called a longitudinal wave?
Find the odd one out.
