Lecture19 - Formation, Kirchoff’s Laws and Wien’s Law...

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The planet Venus: the Earth’s twin (in a limited sense)
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Venus in ultraviolet light What is under The clouds?
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Seeing through the clouds of Venus with Radio Astronomy!
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The Goldstone (California) tracking station and planetary radar
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First result: light is a wave (electromagnetic wave) Wave characterized by wavelength, amplitude DEMO
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Amazing fact of nature: wide range of wavelengths of electromagnetic waves EM radiation includes gamma rays, x-rays, ultraviolet, Light, infrared, microwave, radio
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Concept from physics crucial for astronomy: the spectrum of light DEMO
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The Physics of Spectrum
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Unformatted text preview: Formation, Kirchoff’s Laws and Wien’s Law • Hot opaque solid or liquid produces a continuous spectrum • Hot, tenuous gas observed against dark background produces emission line spectrum • Cold, tenuous gas observed against bright background produces absorption spectrum • See Figure 16.6 Kirchoff’s Laws of Radiation Kirchoff’s First Law + Wien’s Law • Hot, opaque objects produce continuous spectrum • The hotter the object, the bluer it is • Wien’s Law w max = 2.9E-03/T • The hotter an object, the brighter it is...
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This note was uploaded on 03/30/2008 for the course 029 052 taught by Professor Spangler during the Spring '08 term at University of Iowa.

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Lecture19 - Formation, Kirchoff’s Laws and Wien’s Law...

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