Question

27
multiple choice 1 point
if ma is increased, time must ____ to maintain exposure.
○ increase
○ decrease
○ no change

28
fill in the blank 1 point
an image was taken using 150 ma, 0.08 sec., 36 sid. what is the correct adjustment to maintain ir exposure if time is 0.03?
type your answer...

Explanation:

Question 27

Exposure in radiography is \( \text{Exposure} = \text{mA} \times \text{time} \). To maintain exposure, if mA increases, time must decrease (since they are inversely proportional when exposure is constant).

Step1: Recall the exposure formula \( E = \text{mA}_1 \times t_1 = \text{mA}_2 \times t_2 \)

\( 150 \times 0.08 = \text{mA}_2 \times 0.03 \)

Step2: Solve for \( \text{mA}_2 \)

\( \text{mA}_2 = \frac{150 \times 0.08}{0.03} \)
\( \text{mA}_2 = \frac{12}{0.03} = 400 \)

Answer:

B. Decrease

Question 28