A femtosecond is the SI unit of time equal to 10-15 of a second. That is one quadrillionth, or one millionth of one billionth of a second. For context, a femtosecond is to a second, what a second is to about 31.7 million years.
The word femtosecond is formed by the SI prefix femto and the SI unit second. Its symbol is fs.
A femtosecond is equal to 1000 attoseconds, or 1/1000 picosecond. Because the next higher SI unit is 1000 times larger, times of 10-14 and 10-13 seconds are typically expressed as tens or hundreds of femtoseconds.
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A femtosecond is 1000th of a picosecond.
Examples: -- picosecond -- femtosecond -- yoctosecond -- attosecond
Answer: 2.8 seconds has 2.8 seconds.
900,000 seconds = 900,000 seconds.
235 seconds