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

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

1.less than 0 Hz

2.0 to 20 Hz

3.20 to 2000 Hz

4.above 2000 Hz

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