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