An eclipsing binary will a. be more luminous than a visual ...

[schs14]

An eclipsing binary will
 
  a. be more luminous than a visual binary.
  b. also be observed as a spectroscopic binary.
  c. give off most of its light in the infrared.
  d. show a constant Doppler shift in its spectral lines.
  e. show two stars with variable proper motion.

Question 2

The pupil of the human eye is approximately 0.8 cm in diameter when adapted to the dark. The ratio of the light-gathering power of a 1.6-m telescope to that of the human eye is ____.
 
  a. 2
  b. 4
  c. 20
  d. 400
  e. 40,000

[leahm14]

Answer to Question 1

b

Answer to Question 2

e

[schs14]

Excellent

[patma1981]

Gracias!