# Shock Wave Of Jet Plane

The above is a schematic diagram of the shock wave of a jet plane (the sound source) which is flying at a constant velocity of $$v_s.$$ When the sound source moves from $$S_1$$ to $$S_2$$, the sound wave which was generated at $$S_1$$ progresses a distance of $$R$$ as above. Which of the following explanations is correct? (The velocity of sound is $$v$$.)

a) $$v_s$$ is larger than $$v$$.

b) The distance between $$S_1$$ and $$S_2$$ is $$\frac{v_sR}{v}$$.

c) If $$v_s$$ becomes bigger, then $$\theta$$ becomes bigger, too.

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