Philip P. answered 11/02/17
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Intensity follows the inverse square law, I = k/d2
- I = intensity
- d = distance
- k = a constant
At 3m:
I = k/d2
62.5 = k/32
62.5·32 = k
At 2.5 m:
I = k/d2
I = (62.5)(32/2.52) = _____?