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Information from Black Hole

APPHMC-WGEYQY

Astronomers find the existence of black holes by finding 'companions stars' that seem to orbit around nothing.

What kind of information can astronomers learn by analyzing the period and radius of the companions star's motion?

I. Mass of the black hole
II. Acceleration due to gravity near the black hole
III. Escape velocity of the black hole

A

I

B

II

C

I and II

D

II and III

E

I, II, and III