_________ db is the threshold of hearing the faintest sound most of us can hear.

0

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1

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2

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None of the above

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Solution

The correct option is A $0$
The human ear can hear from 0 dB to 120-130 dB. All sound above 90 dB are damaging to inner ears and can do irreversible damage above 120 dB.
So, option A is the correct option.

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2. It makes sound louder so that a person with hearing loss can hear it better.

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4. Amplifies the electrical signal and retransmits them as sound using speakers.

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