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(a) What is the threshold of hearing ? ...

(a) What is the threshold of hearing ?
(b) What is the threshold of pain in the ear ?

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(a) The human ear can detect sound waves `(at 1 kHz)` with an intensity as low as `10^-12 W//m^2`.
(b) At an intensity of `1 W//m^2`, the sound is uncomfortably loud and may be painful to the ear.
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