(a) Explain the terms 'crests' and 'troughs of a wave? What type of waves consist of crests and troughs? (b) The flash of a gun is seen by man 3 seconds before the sound is heard. Calculate the distance of the gun from the man (Speed of sound in air is 332 m/s).

a). Crests are the maximum peaks in transverse waves are called crests.

Troughs are the maximum depths or valleys in transverse waves are called troughs.

b).  Here speed of the sound $=332\ m/s$

Time taken $=3\ s$

Therefore, distance of the man from the gun $=speed\times time$

$=332\ m/s\times3\ s$

$=996\ m$

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Updated on: 10-Oct-2022

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