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Physics & Astronomy
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Inquiry into Physics
Quiz 12: Special Relativity and Elementary Particles
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Question 101
Short Answer
When it comes near a heavy nucleus,a gamma ray,which is a high energy photon,can "disappear," and in its place there will be produced an electron and a positron,which both have mass.According to special relativity,this pair production is an example of __________.
Question 102
Short Answer
If you do an experiment on Earth,and then do an identical experiment in a jet plane moving uniformly at a high speed,you get identical results from both experiments.This is an example of __________.
Question 103
Short Answer
The four fundamental forces in nature are the __________,__________,__________,and __________.
Question 104
Short Answer
A __________ has integral spin.
Question 105
Short Answer
Because of their short lifetimes,very few muons that are produced in the upper atmosphere at high speeds should be observed at the surface of the Earth.Yet we detect large numbers of muons at ground level because of the special relativistic effect of __________.
Question 106
Short Answer
If a 1 kg mass is completely converted into energy,the amount of energy released would be __________.
Question 107
Multiple Choice
t and b quarks are named
Question 108
Multiple Choice
Particles possessing half-integral spins are called _________ and particles with integral spins are called ________.
Question 109
Short Answer
An electron and a positron,which are two massive particles,can annihilate when they come together to produce two photons,which have no mass.According to special relativity,this pair annihilation is an example of __________.
Question 110
Short Answer
A __________ has half-integral spin.
Question 111
Short Answer
The mass of an electron and its antiparticle,a positron,is 0.511 MeV/c
2
.In order to produce an electron-positron pair,a gamma ray must have an energy larger than 1.022 MeV because __________.