First slide

Introduction to waves

Question

A man sets his watch by a whistle that is 2 km away. How much will his watch be in error. (speed of sound in air 330 m/sec)

Easy

A

3 seconds fast
B

3 seconds slow
C

6 seconds fast
D

6 seconds slow

Solution

Time lost in covering the distance of 2 km by the sound waves $t = \frac{d}{v} = \frac{2000}{330} = 6 .06 \sec \approx 6 \sec$

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