PCS 181 Lecture Notes - Lecture 2: Cosmic Microwave Background, Emission Spectrum, Redshift
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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. Obtain spectrum of a stationery (=not moving) source (hydrogen) in the laboratory. Obtain spectrum of a moving object (e. g a star) 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) C=speed of light = 3 x 108 m/s < meters per second. Symbol- delta lamda = wavelength different between lab and stellar spectra. Symbol lamdalab =wavelength on lab pectrum. Vr=69. 1 km/stest question radial velocityand if the star is moving away or closer. H spectral line is lamda =656. 2850nm in the labthis is red wavelength. Same line is lamda =656. 2927 nm in the spectrum of regulus