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Variation of Intensity in Space

db is the thr...

Question

_________ 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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What is a Hearing aid?

1. An electronic, battery operated device which can be worn by people with hearing loss in or behind their ear .

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

3. Receives sound through a microphone and converts it to an electrical signal.

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

Which of the above statements is correct?

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