Tag Archives: Edexcel Physics P3

Edexcel Physics P3: Particles in Action Key Words

Key WordDefinition
Absolute ZeroThe lowest temperature that is theoretically possible, at which particles have no kinetic energy.
Accelerating AnodeTakes the electrons produced by a cathode and accelerates them before they are fired.
Alpha ParticleA +2 charged helium nucleus emitted by some radioactive substances.
Beta ParticleA fast-moving electron emitted by radioactive decay of substances
CathodeThe positively charged electrode of an electrical device, such as a primary cell, that supplies current.
CelsiusA scale of temperature in which water freezes at 0° and boils at 100° under standard conditions.
DecayTo undergo change to a different form by emitting radiation.
Electron BeamA stream of electrons in a gas or vacuum.
Fundamental ParticleA minute portion of matter which as far as we know cannot be broken down further.
Gamma RadiationHighly penetrating electromagnetic radiation.
IsotopeEach of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.
KelvinA scale of temperature with absolute zero as zero.
Kinetic EnergyEnergy possessed by objects that are in motion.
NeutronA subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.
NucleusThe positively charged central core of an atom that contains most of its mass.
OscilloscopeA device for viewing oscillations by a display on the screen of a cathode ray tube.
Particle AcceleratorApparatus for accelerating subatomic particles to high velocities by means of electric or electromagnetic fields.
ParticleA particle smaller than an atom (e.g., a neutron) or a cluster of such particles (e.g., an alpha particle) .
PositronA subatomic particle with the same mass as an electron and a numerically equal but positive charge.
PressureThe continuous physical force exerted on or against an object by something in contact with it
ProtonA stable subatomic particle occurring in all atomic nuclei, with a positive electric charge.
QuarkAny of a number of subatomic particles carrying a fractional electric charge, postulated as building blocks of the hadrons.
RadiationEnergy emitted from a source
RadioactiveEmitting or relating to the emission of ionizing radiation or particles.
TemperatureThe degree or intensity of heat present in a substance or object
Thermionic EmissionThe emission of electrons from a heated source.