What are the units of intensity?

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Multiple Choice

What are the units of intensity?

Explanation:
Intensity measures how much acoustic power passes through a given area each second. Because it’s power per unit area, the units must be a measure of power divided by area. In ultrasound practice, that common expression is watts per square centimeter (W/cm^2). Using just watts would be total power, not intensity, since it doesn’t account for area. Decibels are a logarithmic ratio used for relative comparisons, not an absolute unit of intensity. So the unit that fits the concept is watts per square centimeter.

Intensity measures how much acoustic power passes through a given area each second. Because it’s power per unit area, the units must be a measure of power divided by area. In ultrasound practice, that common expression is watts per square centimeter (W/cm^2). Using just watts would be total power, not intensity, since it doesn’t account for area. Decibels are a logarithmic ratio used for relative comparisons, not an absolute unit of intensity. So the unit that fits the concept is watts per square centimeter.

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