Question: At what distance ( in m ) does a 1 1 0 W lightbulb produce the same intensity of light that a 5 5 W

At what distance (in m) does a 110 W lightbulb produce the same intensity of light that a 55 W lightbulb produces 15 m away? (Assume both have the same efficiency for converting electrical energy in the circuit into emitted electromagnetic energy.)
m

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