Waves

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An observer on the ground hears a sonic boom that is created by an airplane flying at a speed

A sonic boom is

What shape of wake does a bow wave make in back of a moving object.

While jet-skiing on a lake you look back and notice a v-shaped pattern made by overlapping wave crests. This pattern is known as a

An aircraft that flies faster than the speed of sound is said to be

A sonic boom is formed only at the moment an object breaks through the sound barrier.

If the speed of a the source is increased in a bow wave, the shape of the bow wave will be

Bow waves form when the wave source moves faster than the wave speed.