Author Question: An eclipsing binary will a. be more luminous than a visual binary. b. also be observed as a ... (Read 71 times)

schs14 · **on:** Jul 27, 2018

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