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
Fill in the blank.
________ produces a sensation in ears.
We can distinguish between the musical sounds produced by different singers on the basis of the characteristic of sound called :
What causes sound?
What is musical sound? Give an example.
What do you mean by an echo?
Draw a curve showing density or pressure variations with respect to distance for a disturbance produced by sound. Mark the position of compression and rarefaction on this curve. Also, define wavelengths and time periods using this curve.
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.
The speed of sound in air at 0°C is ______.
