- #1
andrewm
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Homework Statement
A flashlight is shining into a box. There are no reflections. We know the power of the flashlight in Watts. We know the volume of the box.
Question: How much energy (associated with the EM field) is in the box?
Homework Equations
The Attempt at a Solution
Integrate the power density (J s^-1 m^-3) over the volume of the box. But what is the power density?
Hints would be preferred over full solutions :)