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 vs.v_s. When the sound source moves from S1S_1 to S2S_2, the sound wave which was generated at S1S_1 progresses a distance of RR as above. Which of the following explanations is correct? (The velocity of sound is vv.)

a) vsv_s is larger than vv.

b) The distance between S1S_1 and S2S_2 is vsRv\frac{v_sR}{v}.

c) If vsv_s becomes bigger, then θ\theta becomes bigger, too.

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