which property describes the amount of energy that flows past a given area per unit of time?

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(1) Answers

euniceneal23

Irradiance is the measure of Watts/m^2. Since energy is in Joules, and time derivative of this is J/s=Watts. Energy over an area is J/m^2. So time rate of change of energy per unit area is Watts/m^2, or irradiance.