Question: At what distance ( in m ) does a 2 0 0 W lightbulb produce the same intensity of light that a 3 0 W

At what distance (in m) does a 200 W lightbulb produce the same intensity of light that a 30 W lightbulb produces 18 m away? (Assume both have the same efficiency for converting electrical energy in the circuit into emitted electromagnetic energy.)

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