1) The GUT era is marked by a) the production of neutrinos b) the splitting of E
ID: 160190 • Letter: 1
Question
1) The GUT era is marked by
a) the production of neutrinos
b) the splitting of EM and weak forces
c) the separation of spacetime and atom forces
d) the dominance of matter over energy
e) all of the above
2) Matter and energy are in equilibrium during the GUT era because
a) large amounts of matter are produced
b) the temperatures are too high for matter to be stable
c) the matter decays quickly
d) neutrinos act as virtual particles
e) the amount of matter is balanced by the amount of energy
3) Quarks and leptons are created around
a) 10-3 secs
b) 10-7 secs
c) 10-13 secs
d) 10-23 secs
e) 10-35 secs
4) And the temperature of the Universe at that time is about
a) 103K
b) 107K
c) 1013K
d) 1017K
e) 1033K
5) Quark production means an exponential growth of quark pairs. If we start with one quark and add energy we get two. Add more energy we get four, then 8, etc. If we can double every nanosecond (10-9 secs), how long until we have 65,536 quarks?
a) 4 nanoseconds
b) 8 nanoseconds
c) 16 nanoseconds
d) 24 nanoseconds
e) 64 nanoseconds
6) High mass particles decay in shorter times and into more light particles than low mass particles. Suppose particle X has a lifetime of 1 nanoseconds and decays into 4 particle B's. Particle Y decays in 10 nanoseconds into 2 particles B's. If I have a box of 10 X's and a box of 20 Y's, how many B's in each box after 20 nanoseconds?
a) 4 and 2
b) 10 and 5
c) 20 and 20
d) 20 and 40
e) 40 and 40
7) Same problem as before, but after only 1 nanosecond how many B's in each box?
a) 20 and 20
b) 20 and 0
c) 40 and 20
d) 40 and 0
e) 0 and 0
8) If 12 mesons combine, how many baryons and anti-baryons are formed?
a) 2
b) 4
c) 6
d) 8
e) none of the above
9) If the Universe is perfectly symmetric, how many matter and anti-matter particles would there be today?
a) 0 and 0
b) 1020 and 1020
c) 1030 and 1030
d) 1040 and 1040
e) 1050 and 1050
10) CP violation is a crack in the symmetry of particles on short time scales. This is magnified to produce an asymmetric in matter/anti-matter by
a) the strong force
b) rapid expansion
c) GUT forces
d) relativity
e) all of the above
Explanation / Answer
1) The GUT era is marked by a) the production of neutrinos b) the splitting of E
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