If distance increases by factor of 3, exposure decreases by which factor?

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Multiple Choice

If distance increases by factor of 3, exposure decreases by which factor?

Explanation:
Exposure from a point radioactive source follows the inverse square law: it is inversely proportional to the square of the distance. So when distance increases by a factor of 3, the exposure becomes 1 divided by 3 squared, which is 1/9 of the original. In other words, the exposure is reduced to one ninth of what it was. This is why the correct factor is 1/9.

Exposure from a point radioactive source follows the inverse square law: it is inversely proportional to the square of the distance. So when distance increases by a factor of 3, the exposure becomes 1 divided by 3 squared, which is 1/9 of the original. In other words, the exposure is reduced to one ninth of what it was. This is why the correct factor is 1/9.

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