PCS 181 Chapter 2: PCS181 WEEK 2 TEXTBOOK NOTES.pdf
7 May 2015
School
Department
Course
Professor
Document Summary
1913: electron is in circular orbit around the proton. Add appropriate amount of energy to atom > electron moves to a higher permitted orbit (=excited state) You can run current through them, you can heat them, you can shake the elements, The bohr orbit = ground state = (n=1) If you excite the electron it will disappear from n=1 and reappear somewhere higher. In hydrogen atom, moving from n=3 to n=2, you have energy emitted as a photon and you get the red light. If the entire pattern of spectral lines is: Shifted to the blue end (blue-shifted) shorter distance between wavecrests (400nm) > objects is moving toward you. Shifted to the red end > greater distance between wavecrests > object is moving away from you. Spectropist determine the elements present on the star. Obtain spectrum of a stationary (=not moving) source (e. g. hydrogen) in the lab. Obtain spectrum of a moving object (e. g. a star)
