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United States (325,381)
Physics (56)
PH 122 (46)
Lecture

Neutrino, quarks, leptons

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Department
Physics
Course
PH 122
Professor
Brian Jones
Semester
Spring

Description
16 April Highest energy cosmic rays 20 3 x 10 eV Same as a baseball pitched at 60 mph New Particles Neutrino Produced in abundance in the sun 6 trillion pass through a human hand per second Every particle has an antiparticle Quarks & Leptons Leptons Electron Electron neutrino Muon Muon neutrino Tau Tau neutrino Quarks Up Down Strange Charm Bottom Top A proton is made of two up quarks and one down quark. A neutron is made of one up quark and two down quarks. An up quark has charge +2/3 e. A down quark has charge -1/3 e. Three laser beams have wavelengths λ = 400 nm, λ = 600 nm, and λ = 800 nm. The power of 1 2 3 each laser beam is 1 W. Rank in order, from largest to smallest, the photon energies E E , a1, 2 in the3e three laser beams. E 1 E >2E 3 Rank in order, from
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