A certain light source illuminates a screen from a certain distance. If a second source can...
A certain light source illuminates a screen from a certain distance. If a second source can illuminate the same screen with the same brightness from twice the distance, how does the power of the 2nd source P2 compare to that of the first P1?
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P2 = 0.5P1 |
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P2 = 4P1 |
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NONE OF THE CHOICES IS CORRECT. |
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P2 = 0.25P1 |
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P2 = 2P1 |
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