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------------------------------------------------ What is the intensity in watts per meter squared of a barely audible 4000-Hz sound?

Answer :

Final answer:

The intensity of a barely audible 4000-Hz sound, also known as the threshold of hearing, is typically around 10^-12 W/m^2. This is constant irrespective of the frequency of the sound. Other environmental factors like pressure, temperature, and relative humidity influence this value.

Explanation:

The intensity of sound is characterized by the amount of energy passing through a unit area in a unit of time. In the field of acoustics, the barely audible intensity of any sound, also known as the threshold of hearing, is usually considered as 10^-12 W/m^2 (watts per meter squared). This value remains constant, irrespective of the frequency of sound, in this case 4000 Hz, as long as other environmental factors like pressure, temperature and relative humidity remain constant. Therefore, the intensity of a barely audible 4000-Hz sound would be around 10^-12 W/m^2.

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