Using a milliampere (mA) setting of 10 with an exposure time of 1.5 seconds equals 15 milliampere-seconds (mAs). If you increase the mA setting to 15, to obtain an image of equal density, how many second(s) of exposure time should be used?

Question

Quizplus · Accepted Answer

To maintain an image of equal density with an increased mA setting, we need to decrease the exposure time. To do this, we can use the formula: mAs1/mA1 = mAs2/mA2, where mAs1 and mA1 are the initial settings and mAs2 and mA2 are the new settings. Plugging in the values given, we get:

15/10 = mAs2/15

Solving for mAs2, we get mAs2 = 22.5 mAs.

To find the new exposure time, we can rearrange the formula to: t2 = mAs2/mA2. Plugging in the values we just found, we get:

t2 = 22.5/15 = 1.5 seconds

This means that the new exposure time should be 1.5 seconds to obtain an image of equal density with an mA setting of 15. Therefore, the correct answer is choice C, 1.0.

Using a Milliampere (MA) Setting of 10 with an Exposure