A billionth of a second is defined as a:
  • 1millisecond
  • 2microsecond
  • 3nanosecond
  • 4picoseconds
Answer:- 1
Explanation:-

Solution:
Nanosecond : A nanosecond (ns) is an SI unit of time equal to one thousand-millionth of a second (or one billionth of a second), that is, 1/1,000,000,000 of a second, or 10−9 seconds.

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