Lesson 3 - Electromagnetic Spectrum.pdf
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This document provides information about the electromagnetic spectrum. It begins by asking questions about how waves in the electromagnetic spectrum differ and how each type is utilized. It then defines key terms like light, electromagnetic spectrum, and the different types of waves. It explains that light is a transverse wave that can travel without a medium. Frequency determines a wave's color/type, with higher frequencies having more energy. The electromagnetic spectrum includes radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. Each type of wave is then described in more detail along with common uses. Videos are provided for further explanation of infrared and the full electromagnetic spectrum.
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- 1. Electromagnetic Spectrum Unit 9 - Light & Sound
- 2. Lesson 3: Questions ● How do the waves in the EM spectrum differ from each other? ● How do we utilize each type of wave in the EM spectrum?
- 3. Vocabulary Define the following vocabulary words: ● Light ● Electromagnetic spectrum ● Radio waves ● Infrared ● Visible light ● Ultraviolet ● X-ray ● Gamma ray
- 5. Light Light Energy - Energy that travels in the form of waves. ○ Example: Sunlight
- 6. Light Light - a transfer of energy that creates a visual sensation ● Light is a transverse wave
- 7. Light ● Light does not need a medium to travel
- 8. Light Frequency - the number of waves passing a point per second ● Units: Hertz (Hz) ● Frequency describes the color/type of light HIGH frequency = Ex. UV Light Waves LOW frequency = Ex. Radio Waves
- 9. Light Light belongs to a larger category of waves called the electromagnetic spectrum. Electromagnetic spectrum - the full range of visible and invisible waves.
- 10. Light The electromagnetic spectrum includes: ● Radio waves ● Microwaves ● Infrared waves (IR) ● Visible light ● Ultraviolet waves (UV) ● X-Rays ● Gamma rays All waves travel 300,000 km/s = SPEED OF LIGHT
- 11. Electromagnetic Spectrum Wavelength Frequency Energy Radio (Microwaves, Radio, TV) Infrared (IR) Ultraviolet (UV) X-Ray Gamma Visible Light R O Y G B I V Wavelength Frequency Energy LONG LOW LOW SHORT HIGH HIGH
- 12. Electromagnetic Spectrum Radio Waves - used in radio and TV, microwave ovens, and radar. ● Amplitude modulation (AM) ● Frequency modulation (FM)
- 13. Electromagnetic Spectrum Microwaves - the shortest-wavelength radio waves ● Cooking and reheating food Radar Waves - waves reflect off objects and return back towards the source they came from ● Doppler Effect Television Waves - carry information for pictures and sound
- 14. Electromagnetic Spectrum Infrared Light (IR) - source of heat and used to discover heat differences ● Warming lamps ● Thermograms
- 16. Electromagnetic Spectrum Visible Light - only light visible to humans ● Color (ROYGBIV)
- 17. Electromagnetic Spectrum Ultraviolet Light - higher frequency than violet ● Sunlight (source of Vitamin D) ○ Excessive exposure damages skin ● Can disinfect air/bacteria
- 18. Electromagnetic Spectrum X-Rays - makes pictures of the inside of solid objects ● X-Ray technology
- 19. Electromagnetic Spectrum Gamma Rays - high energy waves with the greatest penetrating ability of all waves. ● Radiation therapy
- 20. Additional Video Resources Click on the link below to view videos on each of the electromagnetic spectrum waves. Click here to learn more