Question

A proton in a linear accelerator has a de Broglie wavelength of 115pm. What is the speed of the proton?

Answer 1

wavelength in m = h/mv
h is Plancks constant
m is mass proton in kg
v is velocity in m/s

Answer 2

how would you find out the mass?

Answer 3

Go to Google, type in mass proton. Or look in your text/notes.

Answer 4

3.5^3