A unit of time equal to 0.000 000 000 000 001 seconds and with symbol fs
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One quadrillionth of a meter, or 0.000000000000001 meters
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The correct answer is quadrillionth.
it is Millisecond(One thousandth of a second) Microsecond(One millionth of a second) Nanosecond(One billionth of a second) Picosecond(One trillionth of a second)
one-billionth of a second is a nanosecond.