Advertisements
Advertisements
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?
Advertisements
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
Write true or false for a given statement.
Waveforms of two different stringed instruments can be the same.
Why are the waves mentioned by you not audible to us?
What is the nature of sound waves in air?
Which one of the following does not consist of transverse waves?
How are the wave velocity V, frequency f and wavelength λ of a wave related? Derive the relationship.
In which medium the speed of sound is more: humid air or dry air? Give a reason to your answer.
What is sound? What causes it to produce?
A continuous progressive transverse wave of frequency 8 Hz moves across the surface of a ripple tank
If the wavelength of the transverse wave is 32 mm, calculate the speed with which wave travels across the surface of the water.
Explain how the principle of echo is used by
The dolphin to locate small fish as its prey.
