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 ∆f of the waves reflected from the moving baseball. If the fractional frequency shift produced by a baseball is ∆f/f0 = 2.86 x 10-7 , what is the baseball’s speed in km/h?

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 ∆f of the waves reflected from the moving baseball. If the fractional frequency shift produced by a baseball is ∆f/f0 = 2.86 x 10-7 , what is the baseball’s speed in km/h?