PLEASE PLEASE PLEASE HELP!!! I will mark brainy
A speck of dust is 5.0 x 10^-7 m wide. Which of the following is the best way
to rewrite this quantity, using more appropriate units?
A. 5.0 x 10^-5 cm
B. 5.0 x 10^-4 mm
C. 5.0 x 10^-7 m
D. 5.0 x 10^-10 km