This preview shows pages 1–2. Sign up to view the full content.
Physics 4A
THIRD EXAM Chapters 1  11
Fall 2004
1
Name:_________________________________________
Solve the following problems in the space provided. Use the back of the page if needed. Each
problem is worth 20 points. You must
show your work in a logical fashion starting with the
correctly applied physical principles shown on the last page. Your score will be maximized if
your work is easy to follow because partial credit will be awarded.
1. It turns out that neutrons are not stable particles. A neutron will decay into a proton and an
electron. The mass of a proton is 1833 times the mass of an electron. Suppose a neutron,
initially at rest, breaks apart into an electron and a proton. The total kinetic energy of the
electron and proton together is K. Find (a)the net momentum of the electron and the proton as a
system and (b)the kinetic energy of the proton by itself as a fraction of the total kinetic energy.
(a)Since the neutron is initially at rest, the total
momentum of the system is zero before the decay. By
the Law of Conservation of Momentum, the
momentum of the proton plus the electron will also be
zero after the decay.
(b)Applying the Law of Conservation of Momentum,
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
This is the end of the preview. Sign up
to
access the rest of the document.
This note was uploaded on 03/11/2012 for the course PHYSICS 204A taught by Professor Kagan during the Fall '09 term at CSU Chico.
 Fall '09
 Kagan
 Work

Click to edit the document details