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?

Give two examples each of longitudinal waves and transverse waves.

Explain the terms ‘compressions’ and ‘rarefactions’ of wave. What type of waves consist of compressions and rarefactions?

Explain the terms ‘crests’ and ‘troughs’ of a wave? What type of waves consist of crests and troughs?

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 m/s).