The intensity of the sound you hear at a distance of 280cm away from the tuning fork is 7.72 x 10⁻⁶ W/m².
The power carried by sound waves per unit area in a direction perpendicular to that area.
It is defined as the ratio of power and area.
I = P / 4πr²
Given is the radius 280 cm = 2.8 m and power 7.6 x 10⁻⁴ watt, then the sound intensity is
I = 7.6 x 10⁻⁴ / (4 x 3.14 x 2.8²)
I = 7.72 x 10⁻⁶ W/m²
Thus, the intensity of the sound you hear at a distance of 280cm away fr0om the tuning fork is 7.72 x 10⁻⁶ W/m².
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