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Unformatted text preview: 9- 24 AstroStefan Boltzman - Black body radiatorWions Law- “Color Mix” Planck SpectrumDoppler Effect•Source of sound of wavelength•Wavelength gets shortened if source moves toward an observer (Frequency/pitch foes up)•If lengthened it moves away from observerExampleProfessor S. (Ucla)Gun- shoots bullets at 20m/s-No matter how I move-Shoots one bullet a secondShot at 1 bullet/ secBullet hit every ..6 seconds and 1/.6= frequencyDoppler Effect in WaveNatural, unmoving wave lengthTan 0 (Theta) = Vsource / VwaveThe wavelegth gets wider as the wave spreads outLambda received – lambda original = vsource / v wave (Absolute Value)Spectroscopy- forensic astronomy•Use spectrum to figure out composition of sourceKirchoft and Bunsen•Black body radiators•Bunsen (1811-1899) and Kirchoft (1824-1887)•Flame and introduced chemicals colored Flames•Kirchoft- put it through and prism•Emission line spectrum.sharply defined spection of colorsKirchofts second Law•Hot thin gas or vapor•Sharp selection of sharply defined colors (emission line spectrum)...
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This note was uploaded on 12/01/2009 for the course ASTR 50800 at USC.