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ELECTROMAGNETIC SPECTRUM

Learn about types of radiation, wavelength, frequency, uses, hazards, and applications of the electromagnetic spectrum. Discover its significance in planetary and satellite imaging and contemplate its impact on daily life.

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ELECTROMAGNETIC SPECTRUM

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  1. ELECTROMAGNETIC SPECTRUM

  2. Objectives • The types of radiation • Characteristics • Wavelength • Frequency • Uses • Hazards 3. Applications • Understanding planetary images • Understanding satellite photographs

  3. Essential question • What conditions on Earth would change if different wavelength of the EMS travelled at vastly different speeds? • What would we know about our universe if we did not understand the EMS? • How would life be different if humans could see all wavelengths?

  4. Page Keeley’s“Apple in the Dark”

  5. Key question Compare and contrast the waves in the electromagnetic spectrum. * Construct a chart

  6. Cornell Notes • Electromagnetic radiation is a form of energy that travels through space in waves. • Electromagnetic waves are transverse waves. • Properties of these waves depend on their wavelength. • Most electromagnetic radiation except visible light is blocked by Earth’s atmosphere.

  7. Electromagnetic Spectrum

  8. Comparison of wavelength, frequency and energy Radio Microwaves Infrared Visible Ultra-violet X-rays Gamma rays Wavelength decreases • Frequency increases • Energy increases

  9. Visible light is found in the middle of the Spectrum. Red ---- longest wavelength Violet ---- shortest wavelength

  10. Radio Waves • Used for cell phones, TV, communication • In space radio waves are used to detect stars, galaxies, pulsars • Long wavelength, low frequency and low energy

  11. Microwaves • Used on Earth to monitor melting of the polar ice caps due to global warming. • In space microwaves are part of cosmic background which gave clues as to the beginning of the universe. • Measure depth of seas/oceans

  12. Infrared • Heat energy makes skin feel warm • Gives us clues as to the beginning of the universe. • In astronomy infrared radiation can penetrate dust and clouds enabling us to see newly forming stars. • Used to obtain temperature data of land, ocean surfaces and clouds.

  13. Visible • EM waves that we can see • Used for viewing the sun, stars

  14. Ultra Violet • Can cause sunburn/skin cancer in humans • In astronomy help to identify young and old stars. • Short wavelength, high frequency and high energy.

  15. X-rays • Used for medical reasons • In astronomy x-rays help identify neutron stars and black holes. • Short wavelength, high frequency and high energy

  16. Gamma rays • Used to kill cancer cells. • In astronomy help identify neutron stars and black holes. • Short wavelength, high frequency, high energy

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