Our Sun is a star of spectral type
A) F.
B) M.
C) G.
D) S.
C
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The electron microscope's main advantage over the optical microscope is which of the following?
a. greater ease of portability b. dispenses with need for a lens c. higher power lens used d. higher resolution possible
On the graphs shown, you can identify an ice age by looking for __________.
A. a trough (bottom of a dip) on the temperature graph B. a peak on the temperature graph C. a trough (bottom of a dip) on the carbon dioxide graph D. a place on the temperature graph where the temperature curve falls steeply
Uranium-238 decays to Thorium-234 by emitting which of the following?
a. beta b. alpha c. gamma d. positron
When many of the atoms or molecules in a sample have been excited into a metastable state, a(n) ______________ has occurred
a. ultraviolet catastrophe b. population inversion c. coherent emission d. incoherent absorption