What is the intensity of the electromagnetic radiation at a distance of 2.00 m from a 100 W isotropic source? A) 25.0 W/m² B) 6.25 W/m² C) 4.00 W/m² D) 1.99 W/m² E) 1.00 W/m²

Question

Quizplus · Accepted Answer

The intensity of electromagnetic radiation (I) is given by the formula: 
I = P/4πr^2, where P is the power of the source and r is the distance from the source.

Plugging in the given values, we get:
I = 100/4π(2.00)^2
I ≈ 1.99 W/m^2

Therefore, the answer is D) 1.99 W/m^2.

What Is the Intensity of the Electromagnetic Radiation at a Distance