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Prepare your scantron: Setup:

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1 Prepare your scantron: Setup:
Use a pencil, not a pen! Fill in your name and fill the bubbles under your name. LAST NAME FIRST, First name second Put your 4-digit code instead of “IDENTIFICATION NUMBER”. --- (The last 4 digits of your OleMiss ID.) Question # 1: answer A Question # 2: answer C Question # 3: answer A Setup: Reading assignment Chapter 6 (Light and matter) pp. 165 – 189 Grades have been posted. Please take a moment to mute your cell phone!

2 Review questions coming …

3 This question counts double!
sec 8 9 11 7 10 4 1 2 3 13 6 12 25 30 35 40 14 19 16 15 17 18 45 20 5 Question 4 The Doppler effect is observed as … A a change in the diameter of a star. B a change in the brightness of a star. C a shift in the color of the star. D A shift in the wavelengths of spectral lines of a star. E a shift in the location of a star in the sky. Next question coming …

4 This question counts double!
sec 10 9 11 13 14 8 12 6 2 1 3 4 15 5 7 16 26 17 27 28 30 29 24 25 23 19 18 20 21 22 Question 5 The spectrum of a planetary nebula is A a continuous spectrum. B an absorption spectrum. C an emission spectrum. Next question coming …

5 This question counts double!
sec 10 9 11 13 14 8 12 6 2 1 3 4 15 5 7 16 26 25 27 28 30 29 17 24 19 18 23 20 22 21 Question 6 How does rotation affect the spectrum of a star? A All spectral lines are shifted towards the red by the same percent. B All spectral lines broaden by the same percent. C The overall color of the star changes, but not the individual spectral lines. D Spectral lines are shifted towards the red, by a percent depending on the mass of the atom that produces the light. E All spectral lines broaden, by a percent depending on the mass of the atom that produces the light.

6 Spectroscopic binaries
Measure: * Blue/red shift of lines * Time period Earth Calculate: * Orbital speed ( shift in % of wavelength = speed in % of speed of light ) * Size of orbit ( time period × speed = 2 r p ) * Mass of stars ( Kepler III: M × T2 = r3 )

7 Questions coming …

8 sec 10 9 11 12 15 14 13 8 7 1 2 3 5 4 6 16 26 17 27 28 30 29 24 25 23 19 18 20 21 22 Question 7 How do we know the mass of (some) stars? A Using measurements of their planets. B Using measurements of the force of their gravity on spaceships. C Using the red/blue shift of spectral lines of double stars. D Using measurements of their brightness and color. Next question coming …

9 sec 8 9 10 12 11 7 6 1 2 3 4 13 30 35 40 45 14 25 16 15 18 17 19 20 5 Question 8 In a star’s spectrum all the hydrogen lines are shifted towards red, and all the metal (sodium, calcium, etc. ) lines are blueshifted. This could be explained by the following situation: A The hydrogen in the star’s atmosphere is hotter than the metals. B The hydrogen in the star’s atmosphere is colder than the metals. C The star is a double, consisting of a regular star A plus a metal-reach star B. Star A is moving away from us, star B is approaching us as they revolve. D The star is a double, consisting of a regular star A plus a metal-reach star B. Star B is moving away from us, star A is approaching us as they revolve.

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