Intensity: Calculate the light intensity 1.51 m from a light bulb that emits 100 W of visible light, assuming that the light radiates uniformly in all directions. A) 3.49 W/m² B) 4.01 W/m² C) 43.9 W/m² D) 50.5 W/m²

Question

Quizplus · Accepted Answer

The intensity (I) of light at a distance (r) from a point source is given by the formula I = P / (4πr^2), where P is the power of the light source. Substituting P = 100 W and r = 1.51 m into the formula gives I = 100 / (4π(1.51)^2) ≈ 3.49 W/m^2.

Intensity: Calculate the Light Intensity 1