Define "a pole of a magnet"

• Where the magnetic forces are strongest.

• One end of a magnet - either north or south

• The part of a magnet where magnetic field lines come from

Describe what is meant by the ‘direction’ of a magnetic field at a point

• The direction of the force that would act on a north pole placed at that point.

• The opposite way to which the arrows point

• The direction of the force that would act on a south pole placed at that point.

• The way in which the field lines go

The force experienced by current-carrying wires in magnetic fields is caused by...

• The Doppler effect

• The motor effect

• the current effect

• the Primakoff effect

What are the two names for the number of protons in an atom?

• proton number

• atomic number

• nucleon number

• mass number

• aton number

What are the two names for the number of protons and neutrons in an atom?

• proton number

• atomic number

• nucleon number

• mass number

• Protron number

What is the SI unit of radioactivity?

• Hertz (Hz)

• Becquerel (Bq)

• joules per coulomb (J/C)

• joules per second (J/s)

isotopes tend to be...

• more stable

• more unstable

Define radioactive activity

• the rate at which unstable nuclei decay

• the rate at which radioactive emissions are detected

Define count rate

• the rate at which unstable nuclei decay

• the rate at which radioactive emissions are detected

Why are metals good conductors?

• They have a sea of delocalised electrons that are free to move.

• They are magnetic

• Because electricity flows through them well.

• Because they vibrate at a particular frequency.