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Published byGervase Nash Modified over 9 years ago
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A Trip Through the Light Fantastic Dr. Frank Summers Space Telescope Science Institute September 1, 2015
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Contact, Warner Bros 1997
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Visible Light
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InfraredVisible Hotter Star Cooler Star Sun-like Stars Ultraviolet
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Red OrangeYellowGreenBlueViolet ROYGBVROYGBV
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Red OrangeYellowGreenBlueViolet ROYGBVROYGBV Increasing Frequency Increasing Energy Increasing Wavelength
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Energy is proportional to Frequency E = h * ν Energy: Joules, E Planck’s constant: 6.626 * 10 -34 Joule-sec Frequency: oscillations per second (Hz), ν [nu]
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Frequency * Wavelength = Speed of Light ν * λ = c Frequency: oscillations per second (Hz), ν [nu] Wavelength: distance between crests (m), λ [lambda] Speed of Light: 300,000 km/s = 186,000 mi/s, c
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Electromagnetic Spectrum
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Shorter wavelength Higher frequency Larger energy Longer wavelength Lower frequency Smaller energy
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Radio Waves wavelength > 1 meter frequency < 300 MHz
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Radio Bands AM radio –Amplitude modulation –540 to 1600 kHz –WABC-AM 770 = 770 kHz = 770,000 Hz FM radio –Frequency modulation –88 to 108 MHz –WPLJ 95.5 = 95.5 MHz = 95,500,000 Hz
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Microwaves 1 millimeter < wavelength < 1 meter 300 Ghz > frequency > 300 MHz
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Microwave Oven Dielectric heating –2.45 GHz (12.2 cm) –915 MHz (32.8 cm)
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Planck
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Infrared Light 700 nanometers < wavelength < 1 millimeter
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Night Vision is not Infrared Enhanced low light vision
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SOFIA – Stratospheric Observatory for Infrared Astronomy
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Visible Light 400 nanometers < wavelength < 700 nanometers
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Electromagnetic Spectrum
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Ultraviolet Light 10 nanometers < wavelength < 400 nanometers
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X-rays 0.01 nanometers < wavelength < 10 nanometers
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Action Comics #20 by Joe Schuster and Paul Cassidy
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Gamma Rays wavelength < 0.01 nanometers
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Multi-wavelength Montages
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Hubble Space Telescope Spitzer Space Telescope Chandra X-ray Observatory
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Hubble visible Spitzer infrared Chandra x-ray Supernova 1604 - Kepler
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