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Sunday, 21 August 2011
Physics GRE - #20
According to the Standard Model of elementary particles, which of the following is not a composite object?
Muon
Pi-meson
Neutron
Deuteron
Alpha particle
Solution :
The answer is muon. A muon is an elementary particle (a lepton).
Pi - mesons are a quark with an antiquark.
A neutron is made of two down quarks and an up quark.
A deuteron is a proton and a neutron (a proton is two up quarks and a down quark).
An alpha particle is two protons and two neutrons.
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