PCS 181 Lecture Notes - Lecture 2: 30 Foot Fall, Astronomical Unit, Bell Labs

• School: Ryerson University
• Department: Physics
• Course: PCS 181
• Professor: Margaret Buckby

Document Summary

*know the hydrogen spectrum for test # 1. If the entire pattern of spectral lines is: Shifted to the blue end of the spectrum (blue shifted) = Shifted to the red end of the spectrum (red shifted) = Take the spectrum of a stationary (= not moving) source (e. g. , hydrogen) in the laboratory. Take the spectrum of a moving object (e. g. , a star). Hydrogen spectrum in lab compared to stellar spectrum. Two blues, one green, one red = know this laboratory spectrum. Two blues = hydrogen delta, second blue line = 434 nm = hydrogen gamma, one. Green = hydrogen beta, one red = hydrogen alpha. *test question: is the star moving toward you or away from you. Let c = speed of light = 3 x 108 m/s. Triangle delta = wave length difference between lab and stellar (star) spectra. Delta lab = wave length on lab spectrum. Vr = (3 x 108 m/s) = (434. 1 434) nm.