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 formula for calculating light intensity at a distance is:

I = P/4πr^2

where I is the light intensity in Watts/m^2, P is the power of the light source in Watts, and r is the distance from the light source in meters.

Substituting values in the formula:

I = 100/(4π(1.51)^2)
  = 3.49 W/m^2

Therefore, option A is the correct choice.

Calculate the Light Intensity 1