Definitions Quiz

Define Half-life

• The time taken for the activity to reduce to one-half of the initial value

• The time taken for the number of atoms to reduce to one half of the initial value

• The time taken for the half the number of radioactive nuclei, to reduce to one half of the initial value.

• The time taken for a radioactive nuclei, to reduce to one half of the initial value.

Define Activity

• The rate of decay of a sample of radioactive nuclei

• The rate of decrease of radioactive atoms

• The rate of decrease of the number of radioactive atoms

• The rate of decay of a single radioactive nucleus

Define Hadron

• Particles consisting of quarks only

• Particles consisting of quarks or antiquarks

• Particles consisting of leptons

• Particles consisting of Mesons

An electron is an example of a lepton. What categorizes a particle as being a lepton?

• Leptons are not influenced by the strong force (no strong interactions).

• Leptons are not influenced by electromagnetic force (no E&M interactions).

• Leptons are not influenced by the weak force.

• Leptons are made of quarks.

What is a Baryon?

• A hadron consisting of a quark-antiquark pair

• A hadron consisting of 3 quarks

• A hadron of any quark combination that feels the strong force

• An anti-Lepton

What is a Meson?

• A hadron consisting of a quark-antiquark pair

• A hadron consisting of 3 quarks

• A hadron of any quark combination that feels the strong force

• An anti-Lepton

Define the atomic mass unit, u

• Exactly one twelfth of the mass of one atom of Carbon-12

• The mass of one mole of Carbon-12 divided by Avogadro's number

• Exactly one twelfth of the mass of one mole of Carbon-12

• The mass of 12g of Carbon-12 divided by Avogadro's number

Define Magnetic field, B (or magnetic flux density)

What is Faraday's Law?

• When the flux linking an electrical circuit is changing, an emf is induced in the circuit of magnitude equal to the rate of change of flux linkage.

• When the flux in an electrical circuit is changing, an emf is induced in the circuit of magnitude equal to the rate of change of flux.

• The direction of any current resulting from an induced emf is such as to oppose the change in flux linkage that is causing the current.

• The direction of any current resulting from an induced emf is such as to oppose the change in flux that is causing the current.

What is Lenz's Law?

• When the flux linking an electrical circuit is changing, an emf is induced in the circuit of magnitude equal to the rate of change of flux linkage.

• When the flux in an electrical circuit is changing, an emf is induced in the circuit of magnitude equal to the rate of change of flux.

• The direction of any current resulting from an induced emf is such as to oppose the change in flux linkage that is causing the current.

• The direction of any current resulting from an induced emf is such as to oppose the change in flux that is causing the current.