First slide

Introduction to waves

Question

When an aeroplane attains a speed higher than the velocity of sound in air, a loud bang is heard. This is because

Easy

A

It explodes
B

It produces a shock wave which is received as the bang
C

Its wings vibrate so violently that the bang is heard
D

The normal engine noises undergo a Doppler shift to generate the bang

Solution

Sonic boom due to the speed of source more than the speed of sound causes the shock waves.

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