Final answer:
An increase from 78 to 92 kVp will result in an increase in optical density.
Step-by-step explanation:
An increase from 78 to 92 kVp will result in an increase in optical density.
Optical density refers to the darkness or opacity of an image on a radiograph. As the kVp increases, more X-ray photons are produced, resulting in a higher number of photons interacting with the film. This leads to an increase in the overall darkness or density of the image.