Question: Assuming the light from the VLC unit has a beam 0.50 cm in diameter, how much energy does the light deliver in 20 seconds? A.

Assuming the light from the VLC unit has a beam 0.50 cm in diameter, how much energy does the light deliver in 20 seconds?
A. 0.025 J
B. 3.9 J
C. 63 J
D. 5000 J

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