Question

The term nanosecond represents

• A. One thousandth of a second
• B. One millionth of a second
• C. One billionth of a second
• D. One hundredth of a second

Hint:

Common time units: \[ \boxed{ \begin{aligned} 1\ \text{ms} &=10^{-3}\ \text{s}\\ 1\ \mu\text{s} &=10^{-6}\ \text{s}\\ 1\ \text{ns} &=10^{-9}\ \text{s} \end{aligned} } \]

Answer 1

The Correct Option is C

Step 1: Break the second down into smaller units.
One second equals 1000 milliseconds, and each millisecond equals 1000 microseconds, and each microsecond equals 1000 nanoseconds.
Step 2: Multiply these out.
$1000\times1000\times1000=10^9$, so one second contains $10^9$ nanoseconds.
Step 3: Flip it around to get one nanosecond.
If a second holds a billion nanoseconds, then one nanosecond is one billionth of a second.
\[ \boxed{\text{One billionth of a second}} \]