Pearson Edexcel · GCSE · Physics
Course version: 1PH0 · Version from Sept 2016
Describe the electromagnetic spectrum as continuous from radio waves to…
Full specification wording
Topic 5 – Light and the electromagnetic spectrum: 5.11 Describe the electromagnetic spectrum as continuous from radio waves to gamma rays and that the radiations within it can be grouped in order of decreasing wavelength and increasing frequency
The electromagnetic spectrum is one continuous family of radiations running from radio waves at one end to gamma rays at the other, with no gaps between the named regions.
Checked against the Pearson Edexcel 1PH0 specification (opens in a new tab) on .
- Point 8 of 19
Study notes
From the checked teaching notes for this specification point.
The idea
The electromagnetic spectrum is one continuous family of radiations running from radio waves at one end to gamma rays at the other, with no gaps between the named regions. The regions are grouped by wavelength and frequency, and these two quantities change in opposite directions: as wavelength decreases, frequency increases. A useful method is to write the order radio, microwave, infrared, visible, ultraviolet, X-ray, gamma and then check that moving right means shorter wavelength and higher frequency. Because the spectrum is continuous, the boundaries between regions are conventions rather than sharp breaks, and all the radiations travel at the same speed in a vacuum.
What earns the marks
- States that the electromagnetic spectrum is continuous from radio waves to gamma rays with no gaps between the named regions.
- Orders the regions as radio, microwave, infrared, visible, ultraviolet, X-ray and gamma.
- Explains that wavelength decreases and frequency increases when moving from radio waves towards gamma rays.
- Recognises that wavelength and frequency change in opposite directions across the spectrum.
- Identifies that the spectrum is continuous, so boundaries between named regions are conventions rather than sharp breaks.
Common mistakes and how to put them right
Places gamma rays at the long-wavelength end.
Put it right by putting radio waves at the longest wavelength and gamma rays at the shortest.
Treats wavelength and frequency as increasing together.
Put it right by stating that frequency rises as wavelength falls.
Describes the spectrum as a set of separate bands with gaps.
Put it right by stating that it is continuous from radio waves to gamma rays.
Exam tips
- Learn the seven regions in order from radio waves to gamma rays so you can place any named radiation quickly.
- When a question gives a wavelength or frequency, decide the direction of change first, then name the region.
- Check any answer by confirming that shorter wavelength always pairs with higher frequency.
Try the lesson
The start of the Topic 5 – Light and the electromagnetic spectrum: 5.11 Describe the electromagnetic spectrum as continuous from radio waves to gamma rays and that the radiations within it can be grouped in order of decreasing wavelength and increasing frequency lesson, made from checked teaching notes for this specification point.
Have a go first
Which region of the electromagnetic spectrum has the highest frequency?
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