Particle Physics

Which particle is a fundamental particle?

• Antineutrino

• Proton

• Neutron

• Alpha particle

In a beta-plus decay, what are being emitted along with the daughter nucleus?

• positron and antineutrino

• positron and neutrino

• electron and antineutrino

• electron and neutrino

A Geiger-muller tube is held at a distance of about 12 cm from a radioactive source. The radiation emitted from the nuclear isotope was entirely stopped by a 2 mm thick sheet of lead.

Which of the statements can be deduced from the above information about the emission from the isotope?

• it could be alpha, beta and gamma radiation

• it could be beta and gamma radiation, but not alpha radiation

• it could be alpha and gamma radiation, but not beta radiation

• it could be alpha and beta radiation, but not gamma radiation

Which equation represents β^- decay?

• neutron → proton + electron + antineutrino

• neutron → proton + positron + neutrino

• proton → neutron + electron + antineutrino

• proton → neutron + positron + neutrino

The gold nucleus ¹⁸⁵Au₇₉ undergoes alpha decay.

What are the nucleon number and proton number of the nucleus formed by this decay?

• nucleon number = 183, proton number = 79

• nucleon number = 183, proton number = 77

• nucleon number = 181, proton number = 77

• nucleon number = 181, proton number = 75

In an experiment to investigate the nature of the atom, a very thin gold film was bombarded with α-particles.

What pattern of deflection of the α-particles was observed?

• A few α-particles were deflected through angles greater than a right angle.

• All α-particles were deflected from their original path.

• Most α-particles were deflected through angles greater than a right angle.

• No α-particle was deflected through an angle greater than a right angle.

In what way do the atoms of these isotopes differ?

¹²C ₆

¹³C₆

¹⁴C₆

• different charge

• different numbers of electrons

• different numbers of neutrons

• different numbers of protons

What is a correct order of magnitude estimate for the diameter of a typical atomic nucleus?

• 10^-10 m

• 10^-12 m

• 10^-15 m

• 10^-25 m

A thin gold foil is bombarded with α-particles as shown.

(see image)

The results of this experiment provide information about the

• binding energy of a gold nucleus.

• energy levels of electrons in gold atoms.

• size of a gold nucleus.

• structure of a gold nucleus.

Which set of radioactive emissions corresponds to the descriptions given in the table headings?

(see table image)

• A

• B

• C

• D