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A nanosecond
A Nanosecond
1 nanosecond = 10-9 sec = 0.000000001 sec = 1 billionth of a sec. (Roughly the time it takes light/radio to travel one foot.)
A nanosecond is one billionth of a second. In the long form, it is 0.000000001 seconds. As an equation, it is written as 10-9 s.
A decimal is a representation of a number and is independent of the units used. Unless, you are asked to write a nanosecond as a decimal fraction of a second or an hour or whatever.