There are 10-15 seconds in a femtosecond.
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There is 1 million seconds in a Mega-second.
There is no such unit as "macro second".
a femto second is 1000 times smaller 10-15 an atto second is 1000000 times smaller 10-18 According to current thinking, one Planck time = 5.39 * 10-44 seconds is the smallest unit of time that it will ever be possible to measure.
10
Two. The first is TEN and the second is SECONDS