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anja@phs.ae anja@phs.ae
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6 years ago
The hydrogen lines of spectral type A main sequence stars are ____.
 
  a. the strongest
 b. the weakest
 c. the most narrow
 d. useful in determining apparent magnitude
  e. used to estimate the luminosity of the star

Question 2

The radioactive age of a rock is actually the length of time since the material in that rock was last ____.
 
  a. formed
 b. erupted
 c. concentrated
  d. melted
 e. condensed

Question 3

Groombridge 34 is an M2 main sequence star. Based on this information, which statement is true?
 
  a. Groombridge 34 has a surface temperature that is more than the Sun.
 b. Groombridge 34 has mass that is greater than the Sun.
 c. Groombridge 34 is less luminous than the Sun.
 d. Groombridge 34 is more luminous than the Sun.
 e. Groombridge 34 is located near the upper left hand corner on the HR diagram.

Question 4

As a radioactive substance gradually decays, the abundance of daughter ____ gradually increases.
 
  a. atoms
 b. isotopes
 c. elements
  d. cells
 e. nuclei
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StewartStewart
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6 years ago
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anja@phs.ae Author
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#2
6 years ago
Marking this solved, moving on to the next...
wrote...
#3
3 years ago
thank you
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