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

Physics & Space Science

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The superposition of two waves,     and     ,results in a wave with a wavelength of

A.

m.

B.
2 m.

C.
? m.

D.
4 m.

E.
4? m.

Physics & Space Science

How many electrons are there in the third shell of sodium, Na (atomic number 11)?

A) none B) one C) two D) three

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science