There are 1000 femtoseconds in 1 picosecond. So, the conversion factor is:
$\boxed{1\,\text{ps} = 1000\,\text{fs}}$
(b) To convert kilograms (kg) to milligrams (mg), we need to know the relationship between the two units. There are 1,000,000 milligrams in 1
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