Measuring Speed by Radar. A baseball coach uses a radar device to measure the speed of an approaching pitched baseball. This device sends out electromagnetic waves with frequency f0 and then measures the shift in frequency Δf of the waves reflected from the moving baseball. If the fractional frequency shift produced by a baseball is Δf/f0 = 2.86 × 10-7, what is the baseball’s speed in km/h? (Hint: Are the waves Doppler-shifted a second time when reflected off the ball?)
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