A proton consists of ...

• 2 up quarks and 1 down quark

• 1 up quark and 2 down quarks

• 1 up quark and 1 down quark

• 2 up quarks and 2 down quarks

The charge of an anti up quark is ...

The following diagram shows the intensity-energy graph of ...

• α radiation

The following diagram shows the intensity-energy graph of

• ultraviolet radiation

• A: positron, B: electron neutrino

• A: electron, B: electron antineutrino

• A: alpha particle, B: proton

• A: alpha particle, B: neutron

Which of the following is NOT a hadron?

• proton

• neutron

• meson

• muon

• uud to udd

• udd to uud

• uud to ud

• udd to ud

Which of the following is NOT a lepton?

• electron

• positron

• neutrino

• meson

An isotope of an element has the same ... but different number of ...

• proton number, neutrons

• mass number, proton number

• atomic number, proton

• mass number, neutrons

From this α-particle scattering experiment, most particles are not deflected. What does this prove?

• There is a massive nucleus in the middle of the atom

• Atom is mostly empty space

• Atom has a neutral charge

• The nucleus has a positive charge