4-WAV-04a
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Contents
Outcomes
- Pupils can identify the sections of the electromagnetic spectrum.
- Pupils can identify the uses and dangers of sections of the electromagnetic spectrum.
Specification References
- 3.9, 3.10, 3.11, 3.12
Starter
- Show pupils EM spectrum circus.
Main Body of Lesson
- Go through EM circus with group, AGR ppt contains nice pictures to talk about.
- Assign each group of pupils two sections of the EM spectrum, pupils should find the uses of one section and the dangers of another (AGR has hand-out cards for pupils).
- Pupils present uses and dangers to the class.
- During talks pupils should make rough notes, which will then be made into neat notes for homework.
- Alternatively go through the following with the group:
Uses
- Radio - communication
- Microwave - communication, energy transfer (e.g. microwave oven, solar satellite)
- Infrared - thermal energy transfer, night vision
- Visible
- Ultraviolet - sterilisation, tanning,
- X-ray - medical (diagnosis), x-ray diffraction (crystallography)
- Gamma ray - sterilisation, medical (treatment)
Dangers
- Radio - negligible hazard
- Microwave - negligible hazard, internal heating
- Infrared - surface heating
- Visible
- Ultraviolet - blindness, sunburn
- X-ray - blindness, cancers (mutation)
- Gamma ray - blindness, cancers (mutation)
Plenary
- Use Jodrell Bank's Chromoscope to explore the sky in different parts of the spectrum.
Homework
- Using rough notes created in class, combined with textbook/internet, pupils create neat notes on uses/dangers of each section of the EM spectrum.
Additional Information
Resources Required
Textbook References
- Pople 7.11 pp. 160-163