NATS 1745 Final: Chapter 9 - Exam Review Questions.docx
17 Sep 2014
School
Department
Course
Professor
Document Summary
What is the definition of a parsec? (note: the specific values in km aren"t necessary here). What kind of light has the most energy: gamma, radio, gamma, what is a spectroscope? spectrum more clearly, a telescope including a dispersion mechanism. Emission lines predicted by b&k: how did the element helium get its name? a) When huggins discovered this, what did it prove about planetary nebulae (ie. , what are they made of): a planetary nebula: spectrum contains emission lines only. What is the name of this effect: radial motion = motion towards or away from the observer. How about if the spectrum is blueshifted: redshift - spectral lines are shifted toward longer (redder) wavelengths. A redshifted spectrum tells us that the light source is declining. What determines an atom"s chemical element: atoms consist of: protons, neutron and electrons, the number of protons determines the number of electron and its chemical elements, explain (briefly) what causes atoms to produce absorption lines.
