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Is it true that the intensity of light is inversely proportional to the square of the distance from the source of light?

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True

False

answer is A.

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Detailed Solution

The above statement is True.
The inverse-square proportionality can be expressed thus:

I_{2} = I_{1} (\frac{r_{1}}{r_{2}})^{2},

where

I_{1}

is the intensity at the original distance;
⇒

r_{1}

is the original distance;
⇒

I_{2}

is the intensity at the new distance; and
⇒

r_{2}

is the new distance. That is, the proportioning factor is the square of the ratio of the two distances.

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