A Level Aqa Physics With Best Solution

A LEVEL AQA PHYSICS WITH BEST SOLUTION Beta radiation - when B- or B+ particles are emitted following decay of a neutron-rich or proton-rich nucleus Braking distance - Distance travelled by vehicle in time taken to stop Breaking stress/Ultimate tensile stress - Tensile stress needed to break a solid material Brittle - Snaps without bending or stretching when subject to stress Centre of mass - Point through which a single force on the body has no turning affect Charge carriers - Charged particles that move through substance when PD applied across it Kirchoff's 1st Law - Current passing through 2 or more components in series is the same through each component At a junction the total current in = total current out Kirchoff's 2 Law - 2 or more components in series - total PD across all the components is = to sum of the PD's across each component Sum of emf's around complete loop = sum of PD's around the loop Coherent - Constant phase difference and same frequency Conservation rules - Rule that: Baryon no Lepton no Charge Energy Momentum always conserved in interactions Acceleration - change in V per unit t Acceleration of free fall - Acceleration of an object only acted on by force of gravity Accurate - Measurement obtained using calibrated instruments correctly Accuracy - How close to the true value Alpha radiation - Particle consisting of 2 P's and 2 N's Amplitude - Max displacement of oscillating particle from equilibrium position Annihilation - Particle and antiparticle meet, destroy eachother and emit radiation Antibaryon - Hadron w/ 3 quarks Antimatter - Antiparticles with same quantum values but opposite charge to corresponding particles Antinode - Fixed point on stationary wave where amplitude is maximum Atomic number Z - Number of P's in atom nucleus Baryon - Hadron w/ 3 quarks Base units - Units that define the SI system: Kg Amp S M When is strangeness conserved? - Strong interactions How are strange particles created? - Strong interactions How to strange particles decay? - Weak interactions Couple - Pair of equal and opposite forces acting upon the same body but not along the same line Critical angle - The angle of incidence of a light ray must exceed this angle for total internal reflection to occur Critical temperature - Temperature at or below which a superconducting material has zero resistivity