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Understanding the Electromagnetic Spectrum: Types, Properties, and Applications

This lesson explores the electromagnetic spectrum, detailing the various types of visible and invisible light, each with distinct properties such as wavelength, frequency, and energy. Students will learn to describe the speed of light and understand how different sections of the spectrum can be categorized based on these properties. Practical demonstrations will illustrate concepts like dispersion and absorption of different wavelengths. By mastering this content, students will gain a comprehensive understanding of electromagnetic radiation and its relevance in everyday applications.

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Understanding the Electromagnetic Spectrum: Types, Properties, and Applications

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  1. The EM Spectrum 8 August, 2014 Keywords Wavelength, lamda, amplitude, frequency, Hertz, kilohertz, megahertz, speed, metres, kilometres.

  2. All students should be able to: Describe that there are different types of visible and invisible light each with different properties. Most students should be able to: State the speed of light. Some students should be able to: Explain that the em-spectrum can be described in different sections because of different wavelengths and frequencies and that this effects how much energy the light has. Outcomes

  3. Electromagnetic Radiation E-M radiation is basically a movement of energy in the form of a wave. Some examples:

  4. Dispersion practical. Can you split light up? What do you see? Now watch the demo Draw what you see (how can you remember what you see?) Practical Time

  5. Demonstration Your teacher will show you the EM-Spectrum and describe the sections. How do we know they are all there? Why aren’t there any more than this? The Electromagnetic Spectrum

  6. High frequency, _____ wavelength Low frequency, _____ (high) wavelength γ The Electromagnetic Spectrum Each type of radiation shown in the electromagnetic spectrum has a different wavelength and a different frequency: Each of these types travels at the same speed through a _______ (300,000,000m/s), and different wavelengths are absorbed by different surfaces (e.g. infra red is absorbed very well by ___________ surfaces). This absorption may heat the material up (like infra red and _______) or cause an alternating current (like in a __ _______). Words – black, microwaves, long, short, TV aerial, vacuum

  7. Order of EM Spectrum • R • M • I • V • U • X • G • Radio • Microwaves • Infra-red • Visible • Ultraviolet • X-Ray • Gamma • Randy • Monkeys • In • Velvet • Underpants • Xterminate • Gibbons Your turn – come up with your own

  8. BAKER’S “PLAY YOUR EM CARDS RIGHT” Is the Wavelength Higher or Lower? γ TRY AGAIN

  9. higher γ TRY AGAIN

  10. higher γ TRY AGAIN

  11. lower γ TRY AGAIN

  12. higher γ TRY AGAIN

  13. lower γ TRY AGAIN

  14. higher γ TRY AGAIN

  15. γ The Electromagnetic Spectrum The correct order – how can we remember it?

  16. Hotseat

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