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Electrocardiogram is an important means of modern medical diagnosis. Doctors can measure the time interval between two adjacent peaks from ECG, that is, the cardiac cycle, so that they can calculate.
Fig. a, wavelength λ A =25mm, heart rate FA =60 beats/min = 1Hz, and electrogram drawing speed v = λ a f a = 25mm/s. 。
Because the two pictures move at the same speed v, there are:
λ B =20mm, and b's heart rate is F B =vλ B =2520Hz= 1.25Hz=75 beats/min.