The Standard Model

The tau neutrino, the muon neutrino, and the electron neutrino are all

• leptons

• hadrons

• . baryons

• mesons

A lambda particle consists of an up, a down, and a strange quark.

. A lambda particle can be classified as a

• baryon

• lepton

• meson

• photon

Which combination of quarks could produce a neutral baryon?

• $cdt$

• $cts$

• $cdb$

• $cdu$

According to the Standard Model, a proton is constructed of two up quarks and one down quark ( $uud$ ) and a neutron is constructed of one up quark and two down quarks ( $udd$ ). During beta decay, a neutron decays into a proton, an electron, and an electron antineutrino. During this process there is a conversion of a

•  $u$ quark to a $d$ quark

•  $d$ quark to a meson

• baryon to another baryon

• lepton to another lepton

The force that holds protons and neutrons together is known as the

• gravitational force

• strong force

• magnetic force

• electrostatic force

Baryons may have charges of

• +1 $e$ and + $\frac{4}{3}$ $e$

• +2 $e$ and +3 $e$

• -1 $e$ and +1 $e$

• -2 $e$ and - $\frac{2}{3}$ $e$

The composition of a meson with a charge of -1 elementary charge could be

• $s\overline{c}$

• $dss$

• $u\overline{b}$

• $\overline{ucd}$

Which combination of quarks could produce a neutral baryon?

• $cdt$

• $cts$

• $cdb$

• $cdu$

The charge of an antistrange quark is approximately

• $+5.33\ ×\ 10^{-20}\ C$

• $-5.33\ ×\ 10^{-20}\ C$

• $+5.33\ ×\ 10^{20}\ C$

• $-5.33\ ×\ 10^{20}\ C$

Compared to the mass and charge of a proton, an antiproton has

• the same mass and the same charge

• greater mass and the same charge

• the same mass and the opposite charge

• greater mass and the opposite charge