The energy flux F from a star is the
A) amount of visible light energy emitted by each square meter of the star's surface each second.
B) amount of energy emitted by each square meter of the star's surface each second.
C) total energy emitted by the star over its lifetime.
D) amount of energy emitted by the entire star each second.

Question

Quizplus · Accepted Answer

Energy flux is the amount of energy emitted per unit area per unit time. The correct definition is given in choice B. Choice A only refers to visible light energy and not all forms of energy emitted by the star. Choice C refers to the total energy emitted by the star over its entire lifetime which is not the same as the energy flux. Choice D refers to the total energy emitted by the star which is not the same as the energy flux per unit area.

The Energy Flux F from a Star Is the