Cardiac circuit is an important means of modern medical diagnosis. Doctors can measure the time interval between two adjacent peaks from the electrocardiogram, that is, the cardiac cycle, so they can

Cardiac circuit is an important means of modern medical diagnosis. Doctors can measure the time interval between two adjacent peaks from the electrocardiogram, that is, the cardiac cycle, so they can count it. Fig. a, wavelength λ A =25mm, heart rate FA =60 beats/min = 1Hz, and electrogram drawing speed v = λ a f a = 25mm/s. 。

In Figure B, λ B =20mm, and the heart rate of B is F B =vλ B =2520Hz 1.25Hz=75 beats/min.

So the answer is: 25, 75