anonymous
  • anonymous
My last question of the night..please help The intensity I of light bulb varies inversely as the square of the distance d from the light bulb. Suppose I is 250 w/m^2 when the distance is 5 m. How much farther would it be to a point where the intensity is 40 w/m^2?
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
250 : 5 1: 1250 x : 40 x = 31.25m
anonymous
  • anonymous
I1= 250 I 2 = 40 D1= 5M D2=? \[I1\div I2\]=\[D2 ^{2} \div D1^{2}\] \[250 \div 40 =D2^{2}\div25\] \[D2 =12.5 M\]

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