The star named Circini has the spectral type and luminosity class ...

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The star named Circini has the spectral type and luminosity class of O 8.5 V. Based on this information, which of the following are true? I. Circini has a surface temperature less than the Sun. II. Circini has a diameter that is greater than that of the Sun. III. Circini is more luminous than the Sun. IV. Circini is located near the upper left-hand corner in the H-R diagram.
 
  a. I & II
  b. II & IV
  c. II, III, & IV
  d. I, II, & III
  e. I, II, III, & IV

Question 2

___________ is absorbed by ozone in Earth's atmosphere that is located between 20 km and 40 km above Earth's surface. Therefore, telescopes to observe this radiation must be placed in space.
 
  a. Infrared radiation
  b. Ultraviolet radiation
  c. Radio wave radiation
  d. X-ray radiation
  e. Visible light

[Alyson.hiatt@yahoo.com]

Answer to Question 1

c

Answer to Question 2

b

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Thanks for the timely response, appreciate it

[yeungji]

Great answer, keep it coming