A light source radiates 60.0 W of single-wavelength sinusoidal light uniformly in all directions.What is the average intensity of the light from this bulb at a distance of 0.400 m from the bulb? A)14.9 W/m² B)37.2 W/m² C)27.4 W/m² D)11.9 W/m² E)29.8 W/m²

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Quizplus · Accepted Answer

The average intensity (I) is given by the formula I = P / (4πr²), where P is the power (60.0 W) and r is the distance (0.400 m). Calculating gives I = 60 / (4π(0.4)²) = 29.8 W/m².

A Light Source Radiates 60