# Find Distance proton traveled AP Problem

1. May 23, 2012

### lrp3395

The momentum of a particular proton is
20
5.5 10 kg m s
-
¥ i . Relativistic effects can be ignored throughout this
question.
(a) Calculate the de Broglie wavelength of the proton.
(b) Calculate the kinetic energy of the proton.
The proton is directed toward a very distant stationary uranium nucleus,
235
92
U . The proton reaches a distance D
from the center of the nucleus and then reverses direction. Assume that the nucleus is heavy enough to remain
stationary during the interaction.
(c) Calculate the value of D.

I have no idea how to do part C please help

2. May 24, 2012

### Zubeen

This site is meant to make you think, and not to just give you the answers SO I WILL JUST MAKE YOU UNDERSTAND THE CONCEPT BEHIND IT.
you have momentum of the proton, so you can get the energy of it.
now the forces here involved are all conservative in nature (Electrostatic force is conservative ) so the mechanical energy of the proton when its too far from the uranium will be equal to the mechanical energy of the proton when its at distant D form uranium.
With these things in mind you can easily get the answer.
Zubeen