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06/11/2021 4:51 pm
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(a) Explain the terms ‘compression’ and ‘rarefactions’ of a wave. What type of waves consists of compression and rarefaction?
(b) A worker lives at a distance of 1.32 km from the factory. If the speed of sound in air be 330 m/s how much time will the sound of factory siren take to reach the worker?
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06/11/2021 4:53 pm
(a) Compression is a part of a longitudinal wave in which the particles of the medium are close to each other which reduces the volume of the medium.
Rarefaction is also a part of a longitudinal wave in which the particles of the medium are farther apart from each other which increases the volume of the medium.
(b) Speed = 330 m/s
Distance = 1.32 km = 1320 m
Time = \(\frac{Distance}{Speed}\)
= \(\frac{1320}{330}\) = 4s