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Lecture 2

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PCS 181
Margaret Buckby

The Doppler effect in asronomy Short wavelength= blue light/blue start that’s moving= blue shiftied(moving closer to you peaks are squished)....whole pattern of lines moved towards the blue in the spectrum Long wavelength= red light/red shifted.....moving away peak are farther? -obtain spectrum of a stationery (=not moving) source (hydrogen) in the laboratory -obtain spectrum of a moving object (e.g a star) -compare the 2 spectra Diagram lab spectra emission spectrum compard to stellar spectrum (absorbtion).....lines in the star spectrum are shifted to the red side compared to the lab spectrum therefore its red shifted(moving away) Doppler effect to determine velocity -c=speed of light = 3 x 10 m/s < meters per second - symbol-“delta lamda”= wavelength different between lab and stellar spectra - symbol – “lamda ” labvelength on lab pectrum - vr= radial velocity of star - then -velocity of star V r (3x10 m/s) V r 6.91x10 m/s V r69.1 km/s..................test question – radial velocity....and if the star is moving away or closer Radila velocity problem H spectral line is “lamda”=656.2850nm in the lab.....this is red wavelength Violet is in 400 rnge Yellowish green tinge is in 550 range Same line is “lamda”=656.2927 nm in the spectrum of Regulus
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