Ultra Fast Pulse Lasers Can Emit Pulses of the Order $\mu$

Multiple Choice

Ultra fast pulse lasers can emit pulses of the order 10 fs.The length of each pulse that is 10 fs long is

A) 1.0 $\mu$ m
B) 2.0 $\mu$ m
C) 3.0 $\mu$ m
D) 9.0 $\mu$ m
E) 12.0 $\mu$ m