Spectra are often represented as graphs of:

Spectra are often represented as graphs of:
 
  A) distance versus luminosity.
  B) temperature versus density.
  C) intensity versus wavelength.
  D) brightness versus darkness.

Question 2

In the context of a star's spectrum, which of the following statements is true of a giant star?
 
  A) Hydrogen atoms in its atmosphere do not often collide with each other.
  B) Its atmosphere is very dense.
  C) Its spectrum has very broad spectral lines.
  D) Energy levels are not distorted when atoms in its atmosphere collide.

Question 3

L dwarfs and T dwarfs are spectral classes of _____.
 
  A) brown dwarf stars
  B) red giant stars
  C) Y dwarf stars
  D) white giant stars

Question 4

Which of the following stars is a luminous red supergiant and is classified M2 Ia?
 
  A) Spica
  B) Betelgeuse
  C) Pollux
  D) Miaplacidus

Question 5

In a binary system, the most massive star:
 
  A) shows a large Doppler shift.
  B) is farthest from the balance point of the system.
  C) follows the largest orbit.
  D) is closer to the center of mass.