How is a luminosity class assigned to a star? a. by combining ...

[Medesa]

How is a luminosity class assigned to a star?
 
  a. by combining the apparent magnitude with the star's parallax
  b. by measuring the period of variability in the star's apparent magnitude
  c. by studying the absorption line width in the spectrum of the star
  d. by observing the angular size of the star's image in a photograph or digital image

Question 2

The largest single-dish radio telescope is
 
  a. suspended on cables in a valley.
  b. buried deep in a mine underground.
  c. orbiting in space.
  d. suspended from balloons in the upper atmosphere.

[bd5255]

Answer to Question 1

c
RATIONALE: Line broadening is associated with line width.

Answer to Question 2

a

[Medesa]

Excellent

[bitingbit]

Thanks for the timely response, appreciate it