Calculate the light intensity 1.45 m from a light bulb that radiates 100 W equally in all directions. A)3.78 W/m² B)4.36 W/m² C)47.6 W/m² D)54.7 W/m²

Question

Quizplus · Accepted Answer

The intensity (I) of light at a distance (r) from a point source that radiates equally in all directions is given by the formula I = P / (4πr^2), where P is the power of the source. Substituting P = 100 W and r = 1.45 m, I = 100 / (4π(1.45)^2) ≈ 3.78 W/m^2.

Calculate the Light Intensity 1