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Wednesday 10-2-13

Wednesday 10-2-13. WU: Compare a radio wave to a microwave. a) Which has a higher frequency? b) Which has a longer wavelength? Check Starlight Starbright worksheet Spectrum Analysis. Spectrum Analysis OnLevel.

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Wednesday 10-2-13

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  1. Wednesday 10-2-13 • WU: Compare a radio wave to a microwave. a) Which has a higher frequency? b) Which has a longer wavelength? • Check Starlight Starbright worksheet • Spectrum Analysis

  2. Spectrum AnalysisOnLevel

  3. -Spectrums A, B, and C are from identical stars. -A represents a spectrum from an unmoving star.-B and C show stars in motion with respect to us • What is the approximate range in nanometers that the black lines fall in for each spectrum. • Which spectrum is that of a star moving toward Earth? Explain. • Moving away from Earth? • In comparison to A, which is moving faster. B or C? Justify your answer. C= 430-470 blue A = 550-570 yellow/green B= 600-650 orange C – Blue shifted (smaller wavelength) B – Red shifted (longer wavelength) C, it is shifted farther from original

  4. Below are the bright line spectra of four elements and the spectrum of an unknown gas. • Which elements are in the unknown? Explain. b) Why are you able to exclude the presence of the other elements? c) Young stars are mostly hydrogen with a small abundance of helium and other elements. Is the unknown a likely spectrum for a young star? Explain your answer. 700 400 Hydrogen and Helium. The unknown has all of the hydrogen and helium lines. The unknown does not contain all of the lines for lithium or sodium Yes this is likely to be a young star because it contains hydrogen and helium

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