text: Answer 3.\n\nThe number of x-ray events is directly dependent on the mA setting - each electron will cause an x-ray quant as it is decelerated.\n\nHigher kVp will make the x-rays more energetic, i.e. less likely to interact with light elements on their way to the film.\n\nLow atomic number means that only softer radiation can be absorbed by the atom, creating less of a white shadow on the film.