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Sound is detected when a sound wave causes the eardrum to vibrate. Typically, the diameter of the eardrum is about 8.4 mm in humans. When someone speaks to you in a normal tone of voice, the sound intensity at your ear is approximately 1.0×10−6W/m2.

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Answer:

How much energy is delivered to your eardrum each second?

= 5.54 × 10⁻¹¹J/s

Explanation:

I = P / A

A = πr²

r = 8.4mm/2

 = 4.2mm

 = 4.2 × 10⁻³m

A = 3.143 × (4.2 × 10⁻³m)²

= 55.4425 × 10 ⁻³m²

P = A× I

  = (55.4425 × 10 ⁻³) (1.0×10⁻⁶)

  = 5.54 × 10 ⁻¹¹ J/s

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