- #1

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A supersonic jet traveling at Mach 3 (means that the speed of the jet is three times faster than the speed of sound in air) at an altitude of 20,000 m is directly overhead at t(time) = 0. How long will it be before the ground observer encounters the shockwave? Where will the plane be when it is finally heard? (Assume that the speed of sound in air is uniform at 345 m/s)

This problem is listed under the Doppler Effect in my textbook