PH109 Quiz 1 – Parallax
1
(1 point) How does the observed parallax change if the star observed is closer to the
Earth?
a. It decreases.
b. It increases.
c. It does not change.
Your Answer: B
Correct.
2
(1 point) How does enlarging the earth's orbit change the observed parallax?
a. It increases.
b. It decreases.
c. It does not change.
Your Answer: A
Correct.
3
(1 point) How does tilting the earth's orbit with respect to the star affect the amount of
observed parallax?
a. It increases.
b. It decreases.
c. It does not change
d. It sometimes changes.
Your Answer: C
Correct.
4
(1 point) How does the star's own motion affect the amount of parallax observed?
a. Motion perpendicular to a line from the earth to the star increases it.
b. Motion perpendicular to a line from the earth to the star decreases it.
c. Motion perpendicular to a line from the earth to the star does not affect it.
d. Motion perpendicular to a line from the earth to the star may either increase or decrease it,
depending on the relative motions of the earth and star.
Your Answer: D
Correct.
