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प्रश्न
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?
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उत्तर
(i) The diver would hear the sound first.
(ii) Because the velocity of sound in water (1450 ms-1) is more than the velocity of sound in air (332 ms-1).
(iii) Time taken by sound to reach the diver would be less than t, where t is the time taken by sound to reach the boatman.
Note: Time taken by sound to reach the diver would be 4.36 times less than the time taken by sound to reach the boatman.
संबंधित प्रश्न
Which wave property determines (a) loudness, (b) pitch?
Fill in the blank.
________ produces a sensation in ears.
In an experiment, Anhad studies sound waves. He sets up a loudspeaker to produce sound as shown below :
Anhad adjusts the signal to the loudspeaker to give a sound of frequency 200 Hz.
(a) What happens to the air in-between Anhad and the loudspeaker ?
(b) Explain how Anhad receives sound in both ears.
Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the strings suitably. By doing so he is adjusting :
Complete the following sentences :
Wave velocity = ________________ × wavelength.
What is sound? What causes it to produce?
Number of vibrations produced in one second is ______.
Sound travels in the air as ______ wave.
