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The lowest-intensity sound that is still audible has an intensity of approximately [tex]I_{\text{ear}} = 10^{-12} \, \text{W/m}^2[/tex]. Consider a jet that flies at an altitude of 7000 m.

Answer :

Final answer:

The human ear can detect sounds as low as [tex]1.0 x 10^-^1^2W/m²[/tex] or 0 decibels. Decibels are used to measure sound as they more closely match how we perceive the loudness. Intense sounds such as that from a jet plane can reach 100 decibels or more and cause physical harm.

Explanation:

The human ear is incredibly sensitive. The lowest intensity of sound that we can hear, also known as our threshold of hearing, is about 1.0 x [tex]10^-^1^2[/tex]W/m². This amplitude of sound is recognized to be 0 decibel (dB) because log10(1) equals 0.

Decibels are used rather than absolute values of intensity because they more closely match our experiences with sound. A jet flying at an altitude of 7000m, for example, easy exceeds our threshold of hearing and can measure as high as 100 decibels.

Very intense sounds, like that of a jet plane, can even cause physical pain and prompt damage to our hearing within a short time frame. The zone of pain starts at around 120 decibels.

Learn more about Intensity of Sound here:

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