Key term
AQA GCSE Combined Science Physics 8464
Atomic Structure
Topic overviewThe structure of an atomMass number, atomic number and isotopesFrom the plum pudding model to the nuclear modelChadwick, the neutron, and comparing the modelsRadioactive decay and nuclear radiationNuclear equationsHalf-lives and the random nature of radioactive decayRadioactive contamination
Electricity
Topic overviewCircuit symbols, electrical charge and currentCurrent, resistance and potential differenceOhmic conductors, filament lamps, diodes and thermistorsLight-dependent resistors, and investigating resistanceCurrent and potential difference in series and parallelConstructing circuits, and calculating in series circuitsDirect and alternating potential difference, and mains electricityPower and efficiencyAppliances, and the energy transferred by electrical workPower, and the power ratings of domestic appliancesThe National Grid
Energy
Forces
Topic overviewScalars, vectors, forces and the resultant forceGravityWork done and energy transferStretching, compressing, and the spring constantLinear and non-linear extension, and work done on a springDistance, displacement and speedThe speed of sound, and the distance-speed-time equationVelocity and the distance-time relationshipAcceleration, deceleration and velocity-time graphsArea under a velocity-time graph, and the uniform acceleration equationNewton's First LawNewton's Second and Third LawsStopping distance and reaction timeFactors affecting braking distanceBraking force, deceleration and the dangers of stopping quickly
Magnetism and Electromagnetism
Particle Model of Matter
Waves
Radio waves, and the hazards of ultraviolet, X-rays and gamma rays
- 3 things to know
- Physics Paper 2
Overview
Where gamma rays originate, the changes in atoms and nuclei that generate or absorb electromagnetic waves, the three groups hazardous to body tissue, what radiation dose measures and converting millisieverts to sieverts, drawing conclusions from dose data, and the harm ultraviolet, X-rays and gamma rays do to the body.
What you need to know
Answer each one before you reveal it.
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Key term
Over what range of frequencies can changes in atoms and their nuclei generate or absorb electromagnetic waves?
Key term
Which three groups of electromagnetic waves can have hazardous effects on human body tissue?
Questions from this subtopic
Each one with the model answer underneath.
- 1
Where in an atom do gamma rays originate?
Model answer
In changes in the nucleus of the atom.
- 2
What kinds of change can result in an electromagnetic wave being generated or absorbed?
Model answer
Changes in atoms and changes in the nuclei of atoms.
- 3
Over what range of frequencies can changes in atoms and their nuclei generate or absorb electromagnetic waves?
Model answer
A wide range of frequencies, reaching as high as gamma rays.
- 4
Which three groups of electromagnetic waves can have hazardous effects on human body tissue?
Model answer
Ultraviolet, X-rays and gamma rays.
- 5
What two things decide how harmful an exposure to radiation is?
Model answer
The type of radiation and the size of the dose.
- 6
What does a radiation dose measure?
Model answer
The risk of harm resulting from an exposure of the body to radiation.
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