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What Wavelength Was That? Mr Hemming Examining the Electromagnetic Spectrum with Hands-On Activities.

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Presentation on theme: "What Wavelength Was That? Mr Hemming Examining the Electromagnetic Spectrum with Hands-On Activities."— Presentation transcript:

1 What Wavelength Was That? Mr Hemming Examining the Electromagnetic Spectrum with Hands-On Activities

2 Electromagnetic Waves All travel at the speed of light, 300,000 km /s. (Thats 8 times around the earth in a second!) All can travel through empty space (a vacuum) All can be reflected or refracted The shorter the wavelength the more dangerous they are They all transmit energy from one place to another

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4 Electromagnetic Radiation The only difference between radio waves, visible light, and gamma-rays is the energy of the photons. Radio waves have photons with low energies, microwaves have a little more energy than radio waves, infrared has still more, then visible, ultraviolet, X-rays, and gamma-rays.RadiomicrowavesinfraredvisibleultravioletX-raysgamma-rays

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6 Radio (Low Frequency & Very High Frequency) Emitted by –Astronomical Objects –Radio Station transmitters Detected by –Ground based radio telescopes –Radios

7 Microwave Emitted by: –Gas clouds collapsing into stars –Microwave Ovens –Radar Stations –Cell Phones Detected by –Microwave Telescopes –Food (heated) –Cell phones –Radar systems)

8 Infrared (Near and Thermal) Emitted by –Sun and stars (Near) –TV Remote Controls –Food Warming Lights (Thermal) –Everything at room temp or above Detected by –Infrared Cameras –TVs, VCRs, –Your skin

9 Visible Emitted by –The sun and other astronomical objects –Laser pointers –Light bulbs Detected by –Cameras (film or digital) –Human eyes –Plants (red light) –Telescopes

10 Ultraviolet Emitted by –Tanning booths (A) –The sun (A) –Black light bulbs (B) –UV lamps Detected by –Space based UV detectors –UV Cameras –Flying insects (flies)

11 X-ray Emitted by –Astronomical objects –X-ray machines –CAT scan machines –Older televisions –Radioactive minerals –Airport luggage scanners Detected by –Space based X-ray detectors –X-ray film –CCD detectors

12 Gamma Ray Emitted by –Radioactive materials –Exploding nuclear weapons –Gamma-ray bursts –Solar flares Detected by –Gamma detectors and astronomical satellites –Medical imaging detectors

13 X-rays and Gamma Rays Black holes Active Galaxies Pulsars Diffuse emission Supernovae Gamma-ray bursts Unidentified

14 The Multiwavelength Sun X-Ray UVVisible Infrared Radio Microwave

15 A Mnemonic for the Electromagnetic Spectrum… –Gamma Rays –X-rays –Ultraviolet –Visible –Infrared –Microwave –Radio A CONTEST!!!


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