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Understanding Radio Waves and Microwave Spectra in Astronomy

This lesson compares radio waves and microwaves focusing on their frequency and wavelength properties. It includes analysis of spectra from identical stars, examining how motion affects spectral lines. Students will evaluate black line ranges in nanometers for different spectra and determine which star is moving towards or away from Earth. Further exploration includes identifying elements in an unknown gas spectrum and discussing the likelihood of this spectrum belonging to a young star based on its composition of hydrogen and helium.

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Understanding Radio Waves and Microwave Spectra in Astronomy

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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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