According to the Standard Model of elementary particles, which of the following is NOT a composite object?
A. Muon
B. Pi-meson
C. Neutron
D. Deuteron
E. Alpha particle
(GR9677 #63)
Solution:
A.TRUE
Muon is a lepton. Leptons, along with quarks, are considered the fundamental particles.
B. FALSE
Pi-Meson consists of a quark and its antiparticle. Moreover, a pi-meson is a hadron. Hadrons interact with the strong-force, and all of them are composed of combinations of quarks. (The fundamental particles are classified as quarks and leptons.)
C. FALSE
A neutron is made up of 3 quarks.
D. FALSE
A deuteron consists of a proton and a neutron. (tritium is two neutrons and a proton, while regular Hydrogen is just an electron and proton).
E. FALSE
An alpha particle consists of electrons and protons and neutrons.
Answer: A
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