Biology Forums - Study Force

A measure of the amount of light a star produces is referred to as__________.
 
  A) inherited glare
  B) intrinsic brightness
  C) tidal lighting
  D) differential illumination

Question 2

Which of the following statements is true of giant stars?
 
  A) Supergiant stars are 1000 times smaller than the Sun's diameter.
  B) They have more surface area than main-sequence stars of the same temperature.
  C) They have very low luminosities because of their big size.
  D) Red dwarfs are giant stars that are hot and have high luminosities.

Question 3

Ninety percent of all normal stars in a Hertzsprung-Russell (H-R) diagram are:
 
  A) in the giant region.
  B) in the supergiant region.
  C) on the random sequence.
  D) on the main sequence.

Question 4

Which of the following systems cannot be analyzed as a visual binary?
 
  A) Binary stars that are separately visible in a telescope
  B) Binary stars that are about 2 AU apart
  C) Binary star systems having orbital periods of hundreds or thousands of years
  D) Binary stars orbiting so close to each other that they are not visible as separate stars

Question 5

Suppose you are observing a light bulb. In this context, which of the following is a difference between intrinsic brightness and apparent brightness?
 
  A) The wattage of the light bulb tells you its intrinsic brightness, whereas the apparent brightness of the light bulb depends on its distance from you.
  B) The size of the light bulb tells you its intrinsic brightness, whereas the apparent brightness of the light bulb depends on its wattage.
  C) The distance from the source of the light bulb tells you its intrinsic brightness, whereas the apparent brightness of the light bulb depends on its size.
  D) The visual wavelength of the light bulb tells you its intrinsic brightness, whereas the apparent brightness of the light bulb depends on its distance from a neighboring light bulb.

Question 6

Red dwarfs:
 
  A) lie in the upper left of the Hertzsprung-Russell diagram.
  B) are the biggest stars in the main sequence.
  C) are cool and small with low luminosities.
  D) appear 1000 times larger than the Sun.

Question 7

Which of the following statements is true of L dwarfs?
 
  A) They are cooler than M stars.
  B) They are cooler than T dwarfs.
  C) They are fainter than T dwarfs.
  D) They are brighter than M stars.

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