According to the inverse square law, if you double the distance from the X-ray source, the exposure intensity changes by what factor?

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Multiple Choice

According to the inverse square law, if you double the distance from the X-ray source, the exposure intensity changes by what factor?

Explanation:
The inverse square law says that intensity falls off proportional to 1/d^2. When you double the distance from the x-ray source, the beam spreads over four times the area, so the energy per unit area drops by a factor of 4. Mathematically, I2 = I1/(2^2) = I1/4, meaning the exposure intensity becomes one quarter of what it was.

The inverse square law says that intensity falls off proportional to 1/d^2. When you double the distance from the x-ray source, the beam spreads over four times the area, so the energy per unit area drops by a factor of 4. Mathematically, I2 = I1/(2^2) = I1/4, meaning the exposure intensity becomes one quarter of what it was.

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