Which of the following is longest? (10^9 nm = 1m; 10^12 pm = 1m)

2.0 nm
200 pm
2.0 × 10^-4 m
2.0 × 10^-9 dm
2.0 × 10^-10 cm

Question

Which of the following is longest? (10^9 nm = 1m; 10^12 pm = 1m)

	2.0 nm
	200 pm
	2.0 × 10^-4 m
	2.0 × 10^-9 dm
	2.0 × 10^-10 cm

anonymous · Answer

why not convert everything to meter?

a pm is a picometer, 10^-12 meter.
a nm is a nanometer, or 10^-9 meter. 
a dm is a decimeter, or 0.1 meter.

does this help?

mazehaq · Answer

I donno what they mean by longest

aaronq · Answer

longest = greatest distance

mazehaq · Answer

so the smallest number will be the greatest distance?

anonymous · Answer

it's like comparing apples and oranges unless we convert them so that they have the same unit...have you decided what's going to be the unit?

mazehaq · Answer

I seriously can't get it :/ I'm not understanding it even after the conversion to all of them to meters.