When an aeroplane attains a speed higher than the velocity of sound in – McqOptions

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1.	When an aeroplane attains a speed higher than the velocity of sound in air, a loud bang is heard. This is because [NCERT 1972; J & K CET 2002]
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
Answer» C. Its wings vibrate so violently that the bang is heard

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