# Shock wave front

#### tina21

Homework Statement
When a vibrating source moves through a medium with speed V, speed of propagation of wave is v. A conical wavefront is set up independent of time. What happens when the source is not vibrating?
Homework Equations
Sin(theta) = v/V
So when the source is not vibrating, it is not setting waves due to vibration? But it is moving so it is still causing disturbance in the medium .... And I happened to read that if the source is moving faster than the speed of sound, a shock wave is set up. How ?

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#### MrsZee

Read about Doppler's effect; the shock wave is there because the source is always ahead of the sound wave it creates; behind the source, there will be a region where waves superimpose; sketch the moving plane, sketch few wave fronts and you will see how they combine. Look up Sonic Bum.

#### tina21

I understand now. Thank you so much

"Shock wave front"

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