In a spectroscopic binary, if a pair shows a combined set of lines tonight, but a maximum split two nights later, its orbital period must be

A) one day.
B) two days.
C) four days.
D) eight days.
E) twelve days.


D

Physics & Space Science

You might also like to view...

Significant Figures: The number of significant figures in 10,001 is

A. two. B. three. C. five. D. six.

Physics & Space Science

When did humans learn that the Earth is not the center of the universe?

A) within the past 500 years B) about 2,500 years ago C) about 1,000 years ago D) We haven't; there is still considerable scientific debate about whether Earth is the center of the universe.

Physics & Space Science

According to the law of reflection, a light ray striking a mirror at an angle of incidence of 30 degrees will leaves the mirror at an angle of

a. 60 degrees. b. 30 degrees. c. less than 30 degrees. d. none of the above.

Physics & Space Science

A bicyclist starts down a hill with an initial speed of 2.0 m/s. She moves down the hill with a constant acceleration, arriving at the bottom of the hill with a speed of 8.0 m/s. If the hill is 12 m long, how long did it take the bicyclist to travel down the hill?

Physics & Space Science