AQA Physics AS Glossary Exam Questions and Answers 100% Pass

AQA Physics AS Glossary Exam Questions and Answers 100% Pass Antineutrino - Answer- The antiparticle of a neutrino. Brittle fracture - Answer- When a stress applied to a brittle material causes tiny cracks at the material's surface to get bigger until the material breaks completely. Absolute refractive index - Answer- The ratio between the speed of light in a vacuum and the speed of light in a material. Antineutron - Answer- The antiparticle of a neutron. Antinode - Answer- A point of maximum amplitude on a stationary wave. Absolute uncertainty - Answer- The uncertainty of a measurement given as a fixed quantity. Antiparticle - Answer- A particle with the same rest mass and energy as its corresponding particle, but equal and opposite charge. Absorption (fibre optics) - Answer- Where some of the energy of a fibre-optic signal is absorbed by the material of the optical fibre. Antiproton - Answer- The antiparticle of a proton Calibration - Answer- Marking a scale on a measuring instrument or checking a scale by measuring a known value. Categorical data - Answer- Data that can be sorted into categories. Atom - Answer- A particle made up of protons and neutrons in a central nucleus, and electrons orbiting the nucleus. Acceleration - Answer- The rate of change of velocity. Centre of mass - Answer- The point which you can consider all of an object's weight to act through. Accurate result - Answer- An accurate result is really close to the true answer. Atomic number - Answer- The number of protons in an atom of an element. Alpha decay - Answer- A type of decay in which an unstable nucleus of an atom emits an alpha particle. Average velocity - Answer- The change in displacement of an object divided by the time taken. Circuit symbol - Answer- A pictorial representation of an electrical component. Cloud chamber - Answer- A chamber filled with a vapour which is used to track the motion of charged particles. Alpha particle - Answer- A particle made up of two protons and two neutrons. Coherent - Answer- Sources (or waves) that have the same wavelength and frequency and a fixed phase difference between them are coherent. Ammeter - Answer- A component used to measure current the flowing through a circuit Baryon - Answer- A type of hadron made up of three quarks. For example, protons and neutrons. Amplitude - Answer- The maximum displacement of a wave, i.e. the distance from the undisturbed position to a crest or trough. Compressive force - Answer- A force which squashes something. Baryon number - Answer- The number of baryons in a particle. Conservation of energy (principle of) - Answer- Energy cannot be created or destroyed. It can be transferred from one form to another, but the total amount of energy in a closed system will not change. Beta-minus decay - Answer- A type of decay in which an unstable nucleus of an atom emits a beta-minus particle (an electron) and an antineutrino. Angle of incidence - Answer- The angle that incoming light makes with the normal of a boundary. Angle of refraction - Answer- The angle that refracted light makes with the normal of a boundary. Beta-plus decay - Answer- A type of decay in which an unstab