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Q.

An echo is produced only, if the distance from the source of sound is


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a

10 m

b

15 m

c

17 m or more

d

5 m 

answer is C.

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Detailed Solution

An echo is produced only, if the distance from the source of sound is 17 m or more.
An echo is heard when the sound we produce returns in our direction after reflection. To produce an echo, the minimum distance between the source of sound and the reflecting body must be 17 m. Echo can be heard even when the distance between them is more than 17 m.
            
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