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प्रश्न
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.
The frequency is measured in hertz.
Fill in the blank.
________ produces a sensation in ears.
Name the two characteristics of sound which differentiate two sounds from each other.
What is sound? What type of waves are sound wave in air?
What are longitudinal waves and transverse waves? Explain with the help of labelled diagrams.
Which of the following frequency of sound can be generated by a vibrating simple pendulum as well as by the vibrating vocal cords of a rhinoceros ?
Define the term amplitude of a wave. Write its S.I. unit.
Arrange the speed of sound in gases Vg, solids Vs and liquids VLin an ascending order.
The sound of an explosion on the surface of a lake is heard by a boat man 100 m away and by a diver 100 m below the point of explosion.
(i) Who would hear the sound first: boatman or diver?
(ii) Give a reason for your answer in part (i).
(iii) If sound takes time t to reach the boatman, how much time approximately does it take to reach the diver?
The diagram given below shows a displacement distance graph of a wave. If the velocity of wave is 160 ms-1, calculate:
- wavelength
- frequency
- amplitude.
From diagram given below calculate:
- velocity of P and Q
- frequency of P, when frequency of Q is 512 Hz.
Assume that both wave are traveling in same medium.
State the effect of pressure on the speed of sound in air.
How do the following factor affect the speed of sound in air?
Moisture in air.
A musical instrument is producing continuous note. This note cannot be heard by a person having a normal hearing range. This note must then be passing through ______.
The sound waves travel faster ______.
Through which medium sound travels faster, iron or water? Give reason.
Describe with diagram, how compressions and rarefactions are produced.
