A man standing 25 m away from a wall produces a sound and receive the reflected sound.
a. Calculate the time after which he recives the reflected sound if the speed of sound in air is 350 m s-1.
b.Will the man be able to hear the echo?explain the answer.
Answers
Answered by
91
(i)
Time = Distance travelled by sound / Speed of sound
= (2 × 25 m) / (350 m/s)
= 0.143 second
(ii) Yes, because the least time for distinct echo to be heard is 0.1 second.
Sound is returning to man in approximately 0.1 second.
Time = Distance travelled by sound / Speed of sound
= (2 × 25 m) / (350 m/s)
= 0.143 second
(ii) Yes, because the least time for distinct echo to be heard is 0.1 second.
Sound is returning to man in approximately 0.1 second.
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Answered by
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Answer:
a. The time after which the man receives the reflected sound
v =2d/t
t=2d/v
=2*25m/350m/s
=0.14s
b. Since 0.14s>0.1s . Therefore, he will be able to hear a distinct echo
Explanation:
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