Final answer:
The ECG paper moves at a standard speed of 25 mm per second, which is crucial for measuring heartbeats accurately. Calculations can be made to determine various heart-related measurements, such as heart rate, or to examine effects of an MRI's magnetic field.
Step-by-step explanation:
The paper in an ECG (Electrocardiogram) machine, typically moves at a standard speed of 25 mm per second. This speed allows for accurate temporal measurement of the different stages of a heartbeat. As for the calculation scenarios provided, a standardized approach can determine variables such as heart rate or the effects of an external magnetic field from an MRI on a patient with a pacemaker.
Example Solutions:
- To determine the heart rate from an ECG, you measure the time between heartbeats in seconds and convert this to beats per minute.
- The magnetic field strength during an MRI can be solved using the Hall voltage formula which relates the induced voltage, the length of the wire, and the speed at which the wire moves through the magnetic field.
- A defibrillator's charge transfer can be calculated by multiplying the current by the duration, and using the charge of an electron, the number of electrons transferred can be computed.