A proton beam is made by accelerating protons in a high voltage electric field. The protons have a velocity of 2.75 x 107 m/s. What is the wavelength of the protons traveling at this very high speed?

Answer 1

I presume this question is after the De Broglie wavelength

so wavelength = h/momentum

where h= Planks constant

and

momentum = mass of proton x velocity.