CCEA A-Level Physics 1210
Physical Quantities, Scalars and Vectors
Moments and Equilibrium
Linear Motion and Dynamics
Newton's Laws of Motion
Linear Momentum and Impulse
Work, Energy and Power
Current, Charge and Potential Difference
Resistance and Resistivity
Internal Resistance and Potential Dividers
Waves
Refraction
Lenses
Superposition, Interference and Diffraction
Quantum Physics
Wave-Particle Duality
Astronomy
Practical Skills and Data Analysis
Deformation of Solids
Thermal Physics
Uniform Circular Motion
Simple Harmonic Motion
The Nucleus and Radioactive Decay
Nuclear Energy, Fission and Fusion
Gravitational Fields
Electric Fields
Capacitors
Magnetic Fields
Charged Particles and Accelerators
Fundamental Particles
Quarks and the structure of hadrons
- 3 things to know
- Unit A2 2
Overview
Three quarks needed at this level, charge of an antiquark compared with its quark and phenomenon called.
What you need to know
Answer each one before you reveal it.
Give the charge of the up quark.
Give the charge of the down quark.
Questions from this subtopic
Each one with the model answer underneath.
- 1
Name the three quarks needed at this level.
Model answer
The up quark, the down quark and the strange quark.
- 2
Give the charge of the up quark.
Model answer
Plus two thirds of the elementary charge.
- 3
Give the charge of the down quark.
Model answer
Minus one third of the elementary charge.
- 4
Give the charge of the strange quark.
Model answer
Minus one third of the elementary charge, the same as the down quark.
- 5
Give the quark composition of the proton and show that the charge is correct.
Model answer
The proton is uud, giving two thirds plus two thirds minus one third, which is plus one.
- 6
Give the quark composition of the neutron and show that the charge is correct.
Model answer
The neutron is udd, giving two thirds minus one third minus one third, which is zero.
Other ways to work this
The same content, four other ways.
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