Question

what characteristic of the x - ray beam is influenced by changes to the source - to - image distance (sid)?
average energy
intensity
penetrability
quality

Explanation:

The intensity of an x - ray beam follows the inverse - square law. As the source - to - image distance (SID) changes, the intensity of the x - ray beam changes. The average energy, penetrability, and quality of the x - ray beam are related to factors such as the tube voltage and filtration, not directly to SID.

Answer:

B. Intensity