How are radio waves produced?

By oscillations in an electrical circuit, which send the waves out from an aerial.

How does the frequency of the current produced in a receiver compare with the frequency of the radio wave absorbed?

It is the same as the frequency of the radio wave.

Explain how a radio wave carries a signal from a transmitter to a receiver.

Oscillations in the transmitting circuit send out the wave, and when the receiving aerial absorbs it the wave induces the same oscillations in that circuit.

Where in an atom do gamma rays originate?

In changes in the nucleus of the atom.

AQA GCSE Combined Science Physics 8464

Atomic Structure

Topic overview The structure of an atom Mass number, atomic number and isotopes From the plum pudding model to the nuclear model Chadwick, the neutron, and comparing the models Radioactive decay and nuclear radiation Nuclear equations Half-lives and the random nature of radioactive decay Radioactive contamination

Electricity

Topic overview Circuit symbols, electrical charge and current Current, resistance and potential difference Ohmic conductors, filament lamps, diodes and thermistors Light-dependent resistors, and investigating resistance Current and potential difference in series and parallel Constructing circuits, and calculating in series circuits Direct and alternating potential difference, and mains electricity Power and efficiency Appliances, and the energy transferred by electrical work Power, and the power ratings of domestic appliances The National Grid

Energy

Topic overview Energy stores and systems Kinetic energy Elastic and gravitational potential energy Energy changes in systems Power Energy transfers in a system The main energy resources, renewable and non-renewable Environmental impact and trends in energy use

Forces

Topic overview Scalars, vectors, forces and the resultant force Gravity Work done and energy transfer Stretching, compressing, and the spring constant Linear and non-linear extension, and work done on a spring Resolving forces and free body diagrams Distance, displacement and speed The speed of sound, and the distance-speed-time equation Velocity and the distance-time relationship Acceleration, deceleration and velocity-time graphs Area under a velocity-time graph, and the uniform acceleration equation Newton's First Law Newton's Second and Third Laws Stopping distance and reaction time Factors affecting braking distance Braking force, deceleration and the dangers of stopping quickly Momentum and its conservation

Magnetism and Electromagnetism

Topic overview Poles of a magnet Magnetic fields around a magnet The compass, and plotting a magnetic field Electromagnetism Fleming's left-hand rule and electric motors Transformer power, and using the transformer equations

Particle Model of Matter

Topic overview Density of materials Changes of state and internal energy Temperature changes in a system and specific heat capacity Changes of state and specific latent heat Particle motion in gases

Waves

Topic overview Transverse and longitudinal waves, and the wave equation Wave properties, and refraction at a boundary Types and uses of electromagnetic waves Radio waves, and the hazards of ultraviolet, X-rays and gamma rays

Waves

Radio waves, and the hazards of ultraviolet, X-rays and gamma rays

3 things to know
Physics Paper 2

Overview

How oscillations in a circuit produce radio waves and induce a current in a receiver, where gamma rays originate, what radiation dose measures, and the harm ultraviolet, X-rays and gamma rays do to tissue.

What you need to know

Answer each one before you reveal it.

Your recallNot started

Key term

Why does an alternating current in an aerial send out a radio wave?

Key term

What is produced in a receiving aerial when a radio wave is absorbed by it?

Key term

What kinds of change can result in an electromagnetic wave being generated or absorbed?

Questions from this subtopic

Each one with the model answer underneath.

1
How are radio waves produced?
Model answer
By oscillations in an electrical circuit, which send the waves out from an aerial.
2
Why does an alternating current in an aerial send out a radio wave?
Model answer
The current makes the charges oscillate, and these oscillations produce the electromagnetic wave.
3
What is produced in a receiving aerial when a radio wave is absorbed by it?
Model answer
An alternating current in the circuit.
4
How does the frequency of the current produced in a receiver compare with the frequency of the radio wave absorbed?
Model answer
It is the same as the frequency of the radio wave.
5
Explain how a radio wave carries a signal from a transmitter to a receiver.
Model answer
Oscillations in the transmitting circuit send out the wave, and when the receiving aerial absorbs it the wave induces the same oscillations in that circuit.
6
Where in an atom do gamma rays originate?
Model answer
In changes in the nucleus of the atom.

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