Under the inverse square relationship, doubling the distance from the source results in the exposure becoming:

Under the inverse square relationship, doubling the distance from the source results in the exposure becoming:

• A. It becomes one half
• B. It becomes one quarter
• C. It remains the same
• D. It becomes four times

Answer: (B)

The main concept is that exposure from a radiating source falls off with the square of the distance. If you double the distance, you increase d by a factor of 2, so the exposure becomes 1/(2^2) = 1/4 of what it was. In other words, the exposure drops to one quarter of the original. This reflects why moving farther away greatly reduces exposure. The other options would imply different relationships (linear change, no change, or increase with distance), which do not align with the inverse square law.

The main concept is that exposure from a radiating source falls off with the square of the distance. If you double the distance, you increase d by a factor of 2, so the exposure becomes 1/(2^2) = 1/4 of what it was. In other words, the exposure drops to one quarter of the original. This reflects why moving farther away greatly reduces exposure. The other options would imply different relationships (linear change, no change, or increase with distance), which do not align with the inverse square law.