Final answer:
To produce 6 mAs with a current of 300 mA, the required exposure time would be 20 milliseconds (20 ms).
Step-by-step explanation:
The question asks for the exposure time required to produce 6 mAs when 300 mA has been selected for a particular exposure. The milliampere-seconds (mAs) value is a product of current in milliamperes (mA) and time in seconds (s). To calculate the exposure time needed to achieve 6 mAs at 300 mA, we use the formula:
Exposure Time (s) = Desired mAs / Current (mA)
Substituting the given values:
Exposure Time (s) = 6 mAs / 300 mA
This results in:
Exposure Time (s) = 0.02 s, or 20 ms.
20 milliseconds (20 ms) would be the required exposure time to produce 6 mAs with a current selection of 300 mA.