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 |  | An airplane moving with the velocity of the sound generates the shock wave. | ||||
 | | A source of acoustic waves (airplane) moves with subsonic velocity. As a result the wavelength of the sound in front of airplane will be shorter than the wavelength of the sound behind it (Doppler effect). | ||||
 | | If an airplane moves with supersonic velocity, then the sound waves arising behind it will superpose with each other and form in space a conic surface of high pressure. This is a shock wave. The angle of this cone depends upon the ratio of the speeds of the airplane and the sound (Mach number). | ||||
Eli Priyatna 16 Jun, 2011--
Source: http://basistik.blogspot.com/2011/06/shock-waves.html
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