Physics, 20.08.2019 18:10 johnsonwhitney2

At what distance will a 45 w lightbulb have the same apparent brightness as a 130 w bulb viewed from a distance of 35 m ? (assume that both bulbs convert electrical power to light with the same efficiency, and radiate light uniformly in all directions.)

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At what distance will a 45 w lightbulb have the same apparent brightness as a 130 w bulb viewed from...