AQA · GCSE · Combined Science
Course version: 8464 · Version from Sept 2018
Electromagnetic waves are transverse waves that transfer energy from the…
Full specification wording
Types of electromagnetic waves: Electromagnetic waves are transverse waves that transfer energy from the source of the waves to an absorber.
Electromagnetic waves form a continuous spectrum and all travel at the same speed in a vacuum.
Checked against the AQA 8464 specification (opens in a new tab) on .
- Point 1 of 5
- 4 key terms
Study notes
From the checked teaching notes for this specification point.
The idea
Electromagnetic waves form a continuous spectrum and all travel at the same speed in a vacuum. They are transverse, meaning the oscillations are perpendicular to the direction of energy transfer. Energy is transferred from a source, such as the Sun, a lamp or a radio transmitter, to an absorber, such as a surface that heats up, a radio receiver or a photographic film. The wave does not carry matter; it carries energy. For example, infrared from a heater is absorbed by your skin, increasing its internal energy. The amount absorbed depends on the surface and the wave. Understanding this helps explain heating, communication, and hazards of different regions of the spectrum.
What earns the marks
- States that electromagnetic waves are transverse, with oscillations perpendicular to the direction of energy transfer.
- Identifies a source of electromagnetic waves, such as the Sun, a filament lamp, or a radio transmitter.
- Identifies an absorber of electromagnetic waves, such as a surface that warms up, a radio receiver, or a photographic film.
- Explains that energy is transferred from source to absorber without the transfer of matter.
- Links absorption to an observable effect, such as a temperature rise or a signal detected.
- Recognises that all electromagnetic waves travel at the same speed in a vacuum and can transfer energy through space.
Common mistakes and how to put them right
Saying electromagnetic waves are longitudinal.
Put it right: They are transverse; the oscillations are perpendicular to the direction of energy transfer.
Stating that electromagnetic waves carry matter from source to absorber.
Put it right: They transfer energy, not matter.
Confusing the source with the absorber.
Put it right: The source emits the wave; the absorber receives the energy, often becoming warmer or producing a signal.
Thinking electromagnetic waves need a medium.
Put it right: They can travel through a vacuum, transferring energy from a source such as the Sun to an absorber such as the Earth's surface.
Exam tips
- When describing energy transfer, name a specific source and a specific absorber to make the answer concrete.
- Use the phrase 'transverse wave' and state that oscillations are perpendicular to energy transfer.
- If asked about absorption, link it to an effect such as a temperature increase or a detected signal.
Try the lesson
The start of the Types of electromagnetic waves: Electromagnetic waves are transverse waves that transfer energy from the source of the waves to an absorber. lesson, made from checked teaching notes for this specification point.
Have a go first
Which statement describes the direction of the oscillations as a transverse electromagnetic wave travels through space?
Listen
Electromagnetic waves form a continuous spectrum and all travel at the same speed in a vacuum. They are transverse, meaning the oscillations are perpendicular to the direction of energy transfer. Energy is transferred from a source, such as the Sun, a lamp or a radio transmitter, to an absorber, such as a surface that heats up, a radio receiver or a photographic film. The wave does not carry matter; it carries energy. For example, infrared from a heater is absorbed by your skin, increasing its internal energy. The amount absorbed depends on the surface and the wave. Understanding this helps explain heating, communication, and hazards of different regions of the spectrum. A strong answer earns marks for these points. States that electromagnetic waves are transverse, with oscillations perpendicular to the direction of energy transfer. Identifies a source of electromagnetic waves, such as the Sun, a filament lamp, or a radio transmitter. Identifies an absorber of electromagnetic waves, such as a surface that warms up, a radio receiver, or a photographic film. Explains that energy is transferred from source to absorber without the transfer of matter. A common slip: saying electromagnetic waves are longitudinal. Instead, they are transverse; the oscillations are perpendicular to the direction of energy transfer. Exam tip: When describing energy transfer, name a specific source and a specific absorber to make the answer concrete.
See it
Put it in order
Put these steps in the order they happen.
- 1. Absorber receives energy
- 2. Observable effect: temperature rise or signal detected
- 3. Transverse wave travels
- 4. Source of electromagnetic waves
Key words
Say what each word means before you turn the card.
Transverse
Try answering aloud or in your head before turning the card.
Source
Try answering aloud or in your head before turning the card.
Absorber
Try answering aloud or in your head before turning the card.
Absorption
Try answering aloud or in your head before turning the card.
See every definition
- Transverse
- Describes waves whose oscillations are perpendicular to the direction of energy transfer.
- Source
- The place a wave comes from, such as the Sun, a lamp or a radio transmitter.
- Absorber
- The thing that receives the energy, such as a surface that heats up, a radio receiver or a photographic film.
- Absorption
- The taking in of a wave by a surface or receiver, which can produce an observable effect such as a temperature rise or a signal detected.
Label the diagram
Some boxes have lost their names. Pick the right name for each number.
1Box 1
2Box 2
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