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General Science => General Science => Topic started by: Emilio Romero on 26/04/2010 16:19:39

Title: is there a second sonic boom upon reaching mach 2?
Post by: Emilio Romero on 26/04/2010 16:19:39
Hello, when a plane reaches the speed of sound, and breaks the sound barrier there is a loud bomm... I would like to know if there is a second sonic boom upon reaching mach 2

Thank you
Emilio
Title: is there a second sonic boom upon reaching mach 2?
Post by: wolfekeeper on 27/04/2010 02:37:10
Not exactly... there's ONE continuous sonic boom from the time that an aircraft reaches the sound barrier to the time that it slows down again.

You only *hear* it though when the aircraft flies past you (actually slightly after it has flown past, it takes a while for the sound to reach the ground.)
Title: is there a second sonic boom upon reaching mach 2?
Post by: daveshorts on 27/04/2010 08:42:04
Yes the sonic boom is like the bow wave of a ship which only starts to occur at a certain speed. So if you are going faster than the speed of sound there is always a sonic boom. If you go faster the booms become more intense but are otherwise the same. In fact you often get one sonic boom from the front of the aircraft and another from the back, which is where the double boom comes from.