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ELECTROMAGNETIC SPECTRUM

ELECTROMAGNETIC SPECTRUM. Objectives. The types of radiation Characteristics Wavelength Frequency Uses Hazards 3. Applications Understanding planetary images Understanding satellite photographs. Essential question.

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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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