| Lesson Plan |
| Grade: |
Date: 25/02/2026 |
| Subject: Physics |
| Lesson Topic: Know the main regions of the electromagnetic spectrum in order of frequency and in order of wavelength |
Learning Objective/s:
- Describe the relationship between wavelength, frequency, and the speed of light.
- List the seven main regions of the electromagnetic spectrum in order of decreasing wavelength (increasing frequency).
- Convert between wavelength and frequency for any region using c = λf.
- Explain typical everyday applications of each region.
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Materials Needed:
- Projector or interactive whiteboard
- Slide deck with EM‑spectrum diagram
- Printed worksheet with region tables
- Coloured cards representing each region
- Calculator for λ‑f conversions
- Exit‑ticket slips
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Introduction:
Begin with a quick demonstration: show a radio, a microwave oven, and a UV lamp, asking students what these devices have in common. Recall that all electromagnetic waves travel at the speed of light and differ only in wavelength and frequency. Today they will be able to order the spectrum correctly and explain why each region is useful.
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Lesson Structure:
- Do‑now (5 minutes): Fill a brief table matching everyday examples to EM regions.
- Mini‑lecture (10 minutes): Review c = λf and introduce the seven regions using the slide diagram.
- Guided ordering activity (12 minutes): Arrange coloured cards from longest to shortest wavelength, discussing each placement.
- Conversion practice (8 minutes): Pairs calculate wavelength or frequency for a given value using c = λf.
- Real‑world application discussion (10 minutes): Groups match each region to its common uses from the worksheet.
- Check for understanding (5 minutes): Rapid‑fire questions; students respond with thumbs‑up/down.
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Conclusion:
Summarise that the spectrum runs from radio waves (longest) to gamma rays (shortest) and that c = λf links them. For the exit ticket, each student writes the correct order using the mnemonic R M I V U X G. Homework: complete the worksheet converting three given wavelengths to frequencies.
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