Assignment04 - Duke University Medical Physics Program...

Duke University Medical Physics Program
MP200 - Radiation Physics
Fall 2010
Assignment 04
Due 10/13/10
( Show your work for each problem. Partial credits are awarded.)
1. β
+
decay is associated with what type of neutrino:
(a) a neutrino (b) an antineutrino (c) no neutrino ?
2. The grand unified theory would reduce the number of fundamental
forces to
(a) one (b) two (c) three (d) four (e) five
3. Which process is involved in determining the age of a prehistoric
object?
proton absorption
4. Complete the following nuclear reaction:
12
7
N -→
12
6
C +? + ν
(a) α (b) p (c) β
+
(d) β
-
(e) γ
5. Assuming the radius of a hydrogen atom is given by the Bohr
radius, r
Bohr
= 5 . 29 × 10
- 11
m , what is the ratio of the nuclear
density of a hydrogen atom to its atomic density? Note: Assume
for this calculation that the mass of the atom is equal to the mass
of the proton.
1 . 2 × 10
- 14
1