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

Answer 1

wavelength = h/mv
Solve for wavelength in meters and convert to nm.

Answer 2

how do you convert it into nm

Answer 3

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

Answer 4

is 1.4x10^-15 the correct answer ?

Answer 5

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 1.405E-15 m so I would round that to 1.40E-15 m (to 3 s.f.) which converts to 1.40E-6 nm.

Answer 6

okay. thank you !!