Question

In empty space with no absorption or interference effects, how is the intensity (I) related to the distance from the source squared (r²)?

a) I ∝ r
b) I ∝ 1/r
c) I ∝ r²
d) I ∝ 1/r²

Answer 1

The intensity of electromagnetic waves in empty space with no absorption or interference effects is inversely proportional to the distance from the source squared.

Step-by-step explanation:

The intensity of electromagnetic waves in empty space with no absorption or interference effects is inversely proportional to the distance from the source squared (I ∝ 1/r²). This means that as the distance from the source increases, the intensity of the waves decreases quadratically.