First slide

Introduction to waves

Question

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

Easy

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

Solution

$Time = \frac{Distance}{Velocity} = \frac{1000}{330} = 3 .03 \sec$ .
Sound will be heard after 3.03 sec. So his watch is set 3 sec, slower.

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