How much electromagnetic energy is contained in each cubic metre near the Earth's surface if the intensity of sunlight under clear skies is 1000 W/m2?
A)3.3 * 10-6 J
B)3.3 J
C)0.003 J
D)10-4 J
E)3.0 * 105 J

Question

Quizplus · Accepted Answer

The intensity of sunlight is given as 1000 W/m2. This means that 1000 J of energy falls on each square meter of the Earth's surface every second. The energy density is therefore 1000 J/m3.

How Much Electromagnetic Energy Is Contained in Each Cubic Metre