Author Question: To determine the orbital period of a visual binary, we must measure a. brightness. b. position ... (Read 104 times)

leo leo · **on:** Jul 27, 2018

To determine the orbital period of a visual binary, we must measure

a. brightness.
b. position on the sky.
c. wavelengths.
d. luminosity.
e. temperature.

Question 2

Increasing the diameter of a telescope I. increases its light-gathering power. II. increases its resolving power. III. increases it magnifying power. IV. increases its chromatic aberration.

a. I, II, III, & IV
b. I, II, & III
c. I, II, & IV
d. III & IV
e. I & II