Enter 3 of the following 4 values into the calculator; initial radiation intensity, final radiation intensity, initial distance, final distance. The calculator will solve for the missing value.

## Inverse Square Law Formula

The following formula is used to calculate the values in an inverse square law.

I1 / I2 = d2^2 / d1^2

- Where I1 is the initial radiation
- I2 is the final radiation
- D2 is the final distance
- D1 is the initial distance

## What is the inverse square law?

The inverse square law states that any physical quantity is proportional to the square of the distance from the source of the physical entity.

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