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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
Which characteristics of the sound helps you to identify your friend by his voice while sitting with others in a dark room?
The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute?
What is sound ?
What is a longitudinal wave ?
How does a bat make use of ultrasonics waves to find its way?
In fig. shows a snap shot of a wave from of frequency 50 Hz in a string. The numbers in the diagram represents distance in centimeters. Fpr the wave motion, find
(a) Wavelength,
(b) Amplitude,
(c) Velocity.
What do you mean by the term frequency of a wave? State 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?
What is approximate value of the speed of sound in iron as compared to that in air? Illustrate your answer with a simple experiment.
How do the following factor affect the speed of sound in air?
Pressure in air.
What is sound? Explain with example how does sound travel in a medium.
The smoke from the gun barrel is seen 2 second before the explosion is heard. If the speed of sound in air is 350 ms-1, calculate the distance of observer from the gun.
What type of sound is produced by elephants and whales?
Waves created by Earth Quake are Infrasonic.
A key of a mechanical piano struck gently and then struck again but much harder this time. In the second case
Why is the ceiling and wall behind the stage of good conference halls or concert halls made curved?
Sound travels in the air as ______ wave.
Find the odd one out.
