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A femtosecond is the SI unit of time equal to 10-15 of a second.
The word femtosecond is formed by the prefix femto and the unit second. Its symbol is fs.
The waves of visible light oscillate with a period of about 1 femtosecond.
For a list of times on the order of 1-10 femtoseconds, compare 1 E-15 s.
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