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Q.

An echo of sound is heard after 3 seconds. What is the distance of the reflecting surface from the source if the speed of sound in air is 340 m/s.


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a

500 m

b

510 m

c

480 m

d

420 m 

answer is B.

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Detailed Solution

The distance of the reflecting surface from the source if the speed of sound in air is 340 m/s is 510 m.
Given,
Time taken by the echo of sound to hear, t = 3 s
Speed of sound in air, v = 340 m/s
So, to find the distance of the reflecting surface from the source, the following equation is used
Distance, d = Speed2 × t
On substituting the values, we get
⇒d= 3402×3 ⇒d = 510 m So, the distance of reflecting surface from the source is 510 m.
 
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