Three terrestrial-sized planets in orbits of a fraction of an AU have been found near
A) a white dwarf.
B) a millisecond pulsar.
C) Supernova 1987A.
D) Cygnus X-1.
E) a magnetar.
B
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The superposition of two waves, 
and 
,results in a wave with a wavelength of
A.
m.B.
C.
D.
E.
How many electrons are there in the third shell of sodium, Na (atomic number 11)?
A) none B) one C) two D) three
Will our Sun ever undergo a white dwarf supernova explosion? Why or why not?
A) no, because it is not orbited by another star B) yes, right at the end of its double shell-fusion stage of life C) yes, about a million years after it becomes a white dwarf D) no, because the Sun's core will never be hot enough to fuse carbon and other heavier elements into iron
Rubidium (Z = 37) and potassium (Z = 19) are similar to sodium in that they have ____ electron(s) in the outermost shell
a. five p b. three p c. two s d. one d e. one s