Advertisements
Advertisements
Question
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
Solution
(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.
RELATED QUESTIONS
To detect the obstacles in their path, bats produce ______.
Define the term intensity of a sound wave. State the unit in which it is measured.
What are wavelength, frequency, time period and amplitude of a sound wave?
Define sound ranging.
he sound of an explosion on the surface of a lake is heard by a boatman 120 m away and by a diver 120 m below the point of explosion. Out of the two persons, who would hear the sound first? Why?
Explain how the principle of echo is used by
The bat during its flight at night
Two observers are stationed in two boats 4.5 km apart. A sound signal sent by one, under water, reaches the other after 3 seconds. What is the speed of sound in the water?
