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The intensity of illumination on a su...

The intensity of illumination on a surface from a source of light varies-inversely as the square of the distance of the surface from the source. The effect of moving a piece of paper 3 times as far from the source is to multiply the intensity by 3 divide the intensity by 3 multiply the intensity by 9 divide the intensity by 9

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RS AGGARWAL-RATIO AND PROPORTION-All Questions
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  2. vary inversely with each other. When  is 9. The pair which is not ap...

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