Asked by Steve
Light intensity(lumens) at a depth of x feet has the equation log I/12=-0.0125x
what depth will the light intensity be half that of the surface
what depth will the light intensity be half that of the surface
Answers
Answered by
Steve
at x=0, I = 12
so solve
log 6/12 = -x/8
log2 = x/8
x = 8log2
so solve
log 6/12 = -x/8
log2 = x/8
x = 8log2
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