(a) Explain the terms 'crests' and 'troughs' of a wave? What type of waves consist of crests and ...

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(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 a man 3 seconds before the sound is heard. Calculate the distance of the gun from the man (Speed of sound in air is 332 ย m / s ).

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