What is the complementary unit for milliseconds?

The complementary unit for milliseconds is kilohertz. To understand this relationship, it's important to consider the definitions of these terms in the context of frequency and time.

Milliseconds measure time, specifically one-thousandth of a second. Kilohertz, on the other hand, is a unit of frequency that represents one thousand cycles per second. The relationship between time and frequency is inversely proportional; as the duration (in time) decreases, the frequency (in cycles per second) increases.

In this case, when you convert milliseconds to seconds, 1 millisecond is equal to 0.001 seconds. Therefore, if you want to find the frequency associated with a time period measured in milliseconds, you can use the formula: frequency (in hertz) = 1 / time (in seconds). For example, a period of 1 millisecond would correspond to a frequency of 1,000 hertz, or 1 kilohertz.

This illustrates why kilohertz is the correct complementary unit for milliseconds, as they describe the same phenomenon from different perspectives—time versus frequency.