What is energy per unit area of sound called?

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Multiple Choice

What is energy per unit area of sound called?

Explanation:
Energy per unit area of sound is called intensity. It describes how much acoustic power passes through a surface area each second, so its units are watts per square meter. Power is the total energy transferred per unit time, not normalized by area. Amplitude refers to the size of the pressure or particle displacement in the wave and doesn’t directly measure energy flow per area. Wavelength is the spatial distance of one complete cycle, unrelated to the rate of energy transfer. In formulas, intensity equals power per area (I = P/A), and for a plane wave it’s proportional to the square of the pressure amplitude (I ∝ p^2/(ρc)).

Energy per unit area of sound is called intensity. It describes how much acoustic power passes through a surface area each second, so its units are watts per square meter. Power is the total energy transferred per unit time, not normalized by area. Amplitude refers to the size of the pressure or particle displacement in the wave and doesn’t directly measure energy flow per area. Wavelength is the spatial distance of one complete cycle, unrelated to the rate of energy transfer. In formulas, intensity equals power per area (I = P/A), and for a plane wave it’s proportional to the square of the pressure amplitude (I ∝ p^2/(ρc)).

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