chemistry
posted by tiny .
Estimate the wavelength (in nm) of such a proton moving at 2.81x10^8 m/s (mass of a proton = 1.673x10^27 kg).

wavelength = h/mv
Solve for wavelength in meters and convert to nm. 
how do you convert it into nm

1 m = 1E9 nm so multiply the wavelength you obtain in meters by 1E9.

is 1.4x10^15 the correct answer ?

Your answer is in m. To convert to nm you multiply by 1E9. Also, you are allowed 3 significant figures (from the 2.81) and I obtained 1.405E15 m so I would round that to 1.40E15 m (to 3 s.f.) which converts to 1.40E6 nm.

okay. thank you !!