Chapter Seven Atoms and Starlight by phf13063

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									Chapter Seven: Atoms and Starlight

1) By analyzing light from a star, astronomer’s can retrieve information about a star’s
       a. total energy output
       b. surface temperature
       c. radius
       d. chemical composition
       e. all of the above

2) Of the following, which color represents the lowest surface temperature star?
        a. yellow
        b. blue
        c. orange
        d. red
        e. white

3) The peak of the black body spectrum shifts towards __________ wavelengths when the
temperature increases.
       a. longer
       b. shorter
       c. neither

4) The B-V color index of a star indicates its
       a. density
       b. total mass
       c. radius
       d. chemical composition
       e. surface temperature

5) Which of the following is true of an atomic nucleus?
      a. it contains more than 99.9% of an atom’s mass
      b. it contains all of an atom’s positive charge
      c. it contains no electrons
      d. both a and b above
      e. all of the above

6) The kind of atom depends on
       a. the number of electron shells
       b. the atom’s atomic weight
       c. the number of protons
       d. both a and b above
       e. none of the above
7) A continuous spectrum is produced by
       a. a solid, liquid or dense gas excited to emit light
       b. a low-density gas excited to emit light
       c. inner dense layers of stars
       d. both a and c
       e. all of the above

8) What conditions produce a dark (absorption line) spectrum?
      a. A hot solid, liquid, or high-density gas
      b. A hot low-density gas
      c. light from a continuous spectrum source passing through a cooler and low-density gas
      d. both a and b above
      e. all of the above

9) The highest spectral class and therefore the highest temperature is
       a. O
       b. A
       c. M
       d. B
       e. F
10) The most abundant elements in the Universe are
       a. carbon and nitrogen
       b. hydrogen and helium
       c. oxygen and iron
       d. both a and b
       e. none of the above

11) You research the star Sirius and find that its spectral lines are blue shifted. What does this
tell you about Sirius?
        a. Its surface temperature is higher than that of the sun
        b. It has a transverse velocity that is away from us
        c. It has a transverse velocity that is toward us
        d. It has a radial velocity that is away from us
        e. It has a radial velocity that is toward us

12) One can infer the temperature of stars form
      a. their luminosity
      b. relative strength of absorption lines
      c. relative radial velocity
      d. their color
      e. both b and d

								
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