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Message: <blockquote data-quote="kaushala1988" data-source="post: 10763707" data-attributes="member: 137855">nice.....manna thinawa wena widiya....You can learn a lot about sonic booms by looking at the wakes boats leave in the water.  If you toss a pebble in a pond, little waves will form in concentric  circles and propagate away from the point of impact. If a boat travels  through the pond at 3 to 5 miles per hour, little waves will propagate  in the same way both ahead of and behind the boat, and the boat will  travel through them.  If a boat travels faster than the waves can propagate through water,  then the waves "can't get out of the way" of the boat fast enough, and  they form a wake. A wake is a larger single wave. It is formed out of  all the little waves that would have propagated ahead of the boat but  could not.   When an airplane travels through the air, it produces sound waves. If  the plane is traveling slower than the speed of sound (the speed of  sound varies, but 700 mph is typical through air), then sound waves can  propagate ahead of the plane. If the plane breaks the sound barrier and  flies faster than the speed of sound, it produces a sonic boom when it  flies past. The boom is the "wake" of the plane's sound waves. All of  the sound waves that would have normally propagated ahead of the plane  are combined together so at first you hear nothing, and then you hear  the boom they create.  It is just like being on the shore of a smooth lake when a boat speeds  past. There is no disturbance in the water as the boat comes by, but  eventually a large wave from the wake rolls onto shore. When a plane  flies past at supersonic speeds the exact same thing happens, but  instead of the large wake wave, you get a sonic boom. </blockquote>

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