Q.

What is the frequency range of amplifier used for a phonocardiograph?

A. less than 0 Hz
B. 0 to 20 Hz
C. 20 to 2000 Hz
D. above 2000 Hz
Answer» C. 20 to 2000 Hz
Explanation: The amplifier used for a phonocardiograph has wide bandwidth with a frequency range of about 20 to 2000 Hz. Filters permit selection of suitable frequency bands, so that particular heart sound frequencies can be recorded.
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