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Q.

A man sets his watch by the sound of a siren placed at a distance 1 km away. If the velocity of sound is 330 m/s

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a

His watch is set 3 sec. faster

b

His watch is set 3 sec. slower

c

His watch is set correctly

d

None of the above

answer is B.

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Detailed Solution

Time=Distance Velocity=1000330=3.03 sec.Sound will be heard after 3.03 sec. So his watch is set 3 sec, slower.
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