A spherical wave spreads out from a source, and the energy flux at a distance of R₀ is S₀. At a distance of 2R₀ the energy flux is A) S₀/8. B) S₀/4. C) S₀/2. D) S₀.

Question

Quizplus · Accepted Answer

The energy flux of a spherical wave decreases with the square of the distance from the source. Therefore, if the distance is doubled, the energy flux is reduced by a factor of $2^2 = 4$, making the correct answer $S/4$.

A Spherical Wave Spreads Out from a Source, and the Energy