a few questions?

Question

can you help

1. If a star is found by spectroscopic observations to be about 500 parsecs distant, its parallax is
.2".
.5".
.02".
.002".
.005".


2. Which statement about stellar motion is incorrect?
a. In general, the closer a star is, the more its proper motion.
b. The radial velocity is measured by the Doppler shift.
c.The transverse velocity is measured by the proper motion and the distance.
d. Like parallax, proper motion is measured over intervals of exactly six months.
e.The Pythagorean theorem relates space, transverse, and radial velocities.

3. While Sirius, the Dog Star, is type AO, a star just a step hotter than M0 is a related
M1.
K9.
F5.
AOK.
B9.

thanks

Answer 1

1) I think 0.002" because using aprossimations for little angles we can consider that parallax is 1" / n°parsecs
2)d is incorrect
3)I can't understand this question, sorry

Answer 2

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