An exposure time of 0.02 seconds is equal to how many milliseconds?

To determine the number of milliseconds in seconds, it's important to understand the conversion factor between these two units of time. One second is equal to 1,000 milliseconds. Therefore, to convert seconds to milliseconds, you multiply the number of seconds by 1,000.

In the case of an exposure time of 0.02 seconds, the calculation would be as follows:

0.02 seconds * 1,000 milliseconds/second = 20 milliseconds.

This shows that an exposure time of 0.02 seconds corresponds exactly to 20 milliseconds. This calculation confirms that the correct answer is indeed 20 msec. Understanding this conversion is crucial for operating an x-ray machine correctly and ensuring accurate settings for exposures.