In a heart pacemaker a pulse is delivered to the heart 81, Ask an Expert

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In a heart pacemaker, a pulse is delivered to the heart 81 times per minute. The capacitor that controls this pulsing rate discharges through a resistance of 1.8 x 106. One pulse is delivered every time the fully charged capacitor loses 60.5% of its original charge. What is the capacitance of the capacitor?

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