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OCR GCSE Combined Science Physics J250

Electricity

Topic overview Charge, and producing static electricity Transfer of electrons in charging and discharging Current as a rate of flow of charge Charge, current and time Series and parallel circuits, and circuit symbols Current, potential difference and resistance Resistors whose resistance changes, and investigating them Linear and non-linear circuit elements from graphs Net resistance in series and parallel Circuits for measurement, and electrical power

Energy

Topic overview Conservation of energy, and energy stores Energy changes on heating, and calculating them Energy of a moving body, a spring and a raised object Dissipation, and energy transfer in domestic devices Power ratings, and calculating efficiency Reducing unwanted energy transfer, and the rate of cooling

Forces

Topic overview Measuring distance and time, and calculating speed Converting units, and rates Vectors and scalars in motion Distance-time and velocity-time graphs Average speed, and the equations of uniform motion How objects interact, and forces as vectors Newton's first law Newton's second law Work done, and stored energy Power, and Newton's third law Stretching, bending and compressing; elastic and plastic Force and extension, linear and non-linear The spring constant, and work done in stretching Gravitational fields, weight and free fall Calculations with weight and gravitational field strength

Global Challenges

Topic overview Typical speeds and everyday accelerations Reaction time, stopping distance and the dangers of large decelerations Stopping distance, acceleration and collision force calculations Energy resources, and trends in their use The national grid, and step-up and step-down transformers Why the national grid is efficient, and power in a transformer Mains electricity: a.c., d.c. and the domestic supply Live, neutral and earth wires, and electrical danger

Magnetism and Magnetic Fields

Topic overview Permanent and induced magnets, and magnetic poles Magnetic fields, and the dipping compass The magnetic effect of a current, and solenoids

Matter

Topic overview How the atomic model changed, and the structure of the atom The size of atoms, and defining density Density of the states of matter, and density calculations Conservation of mass in changes of state Heating a system, and specific heat capacity Calculations with specific heat capacity and latent heat Gas molecules, temperature and pressure

Radioactivity

Topic overview Protons, neutrons and isotopes Unstable nuclei and the emissions they give out Balancing nuclear equations Electron energy levels, and radiation from atoms Half-life and the randomness of decay Penetration of alpha, beta and gamma Contamination and irradiation, and reducing the hazard

Waves in Matter

Topic overview Amplitude, wavelength, frequency and period The wave equation Transverse and longitudinal waves Modelling waves with ripples and sound Electromagnetic waves as transverse, and energy transfer Frequency and wavelength across the spectrum What our eyes detect, and light as an electromagnetic wave Uses of electromagnetic waves Hazards of ultraviolet, X-rays and gamma rays Investigating reflection and refraction of light

Waves in Matter

Amplitude, wavelength, frequency and period

3 things to know
Paper 6 (Physics)

Overview

Amplitude, period, wavelength and frequency and their units, the link between period and frequency with calculations, how amplitude relates to energy, how a point in a material moves as a wave passes, and measuring the wavelength of a longitudinal wave.

What you need to know

Answer each one before you reveal it.

Your recallNot started

Key term

What is meant by the amplitude of a wave?

Key term

What is meant by the period of a wave?

Key term

How is the period of a wave related to its frequency?

Questions from this subtopic

Each one with the model answer underneath.

1
What is meant by the amplitude of a wave?
Model answer
The maximum displacement of a point on the wave from its undisturbed rest position.
2
What is meant by the period of a wave?
Model answer
The time taken for one complete wave to pass a fixed point.
3
How is the period of a wave related to its frequency?
Model answer
The period is one divided by the frequency, so the two are reciprocals of each other.
4
A wave completes one full oscillation every 0.02 s. What is its frequency?
Model answer
Its frequency is 50 Hz, because 1 ÷ 0.02 = 50.
5
A wave has a frequency of 200 Hz. What is its period?
Model answer
Its period is 0.005 s, because 1 ÷ 200 = 0.005.
6
How does the amplitude of a wave relate to the energy it transfers?
Model answer
A wave of larger amplitude transfers more energy.

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Electricity

Energy

Forces

Global Challenges

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gravitationalmagneticnuclear

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AGamma radiation is the most penetrating.

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Current means the rate of flow of electric charge.

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