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At what distance from the Sun is its intensity the same as that of a 90...

At what distance from the Sun is its intensity the same as that of a 90 W lightbulb that is 0.8 m from you? The Sun radiates energy at a rate of about 4×1026W.

Express your answer to one significant figure and include the appropriate units

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Answer #1

Set Watts per meter squared w/r^2 = W/R^2

so the two intensities are equal

so that R = sqrt(W/w) r = sqrt(4×1026/90)*0.8= 1.687×1011.m

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