Item 10Part AAt what distance will a 65 W lightbulb have the same apparent brightness as a 130 W bulb viewed from a distance of 50 m ? (Assume that both bulbs convert electrical power to light with the same efficiency, and radiate light uniformly in all directions.)Express your answer using two significant figures.► View Available Hint(s)T =DIVD ΑΣΦ/Submit?m10 ofI

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At what distance will a 65 W lightbulb have the same apparent brightness as a 130 W bulb viewed from a distance of 50 m ?

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter7: Work, Energy, And Energy Resources

Section: Chapter Questions

Problem 31PE: Suppose a star 1000 times brighter than our Sun (that is, emitting 1000 times the power) suddenly...

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Question

Item 10
Part A
At what distance will a 65 W lightbulb have the same apparent brightness as a 130 W bulb viewed from a distance of 50 m ? (Assume that both bulbs convert electrical power to light with the same efficiency, and radiate light uniformly in all directions.)
Express your answer using two significant figures.
► View Available Hint(s)
T =
D
IVD ΑΣΦ/
Submit
?
m
10 of
I

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