Advertisements
Advertisements
Question
An observer sitting in line of two tanks watches the flashes of two tanks firing at each other at the same time, but he hears the sounds of two shots 2s and 3.5s after seeing the flashes. If distance between the two tanks is 510m, find the speed of sound.
Advertisements
Solution
Time taken by the observer to hear the sound of the first tank A= 3.5s
Time taken by the observer to hear the sound of the second tank B = 2s
Time taken by the tank B to hear the sound of tank A= (3.5 - 2)s = 1.5s
Distance between the two tanks = 510m
Speed = 510/1.5=340m/s
APPEARS IN
RELATED QUESTIONS
What is a longitudinal wave ?
List four substances which are good absorbers of sound.
Distinguish between longitudinal and transverse waves.
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?
For which range of frequencies, human ears are most sensitive?
The distance between one crest and one trough of a sea wave is 4.5 m. If the waves are produced at the rate of 240/min, calculate the wave velocity.
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 is echolocation? How do animals make use of this phenomenon?
What happens to the speed of sound when it gases from a solid to a gaseous state?
