Millisecond pulsars _____
a. are created in supernova explosions of the most massive stars
b. result from the collision of two neutron stars
c. represent the youngest pulsars detected
d. result from long-term mass transfer from a companion star
e. are a theoretical prediction that has not been observed
d
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Two unknown resistors A and B are connected together. When they are connected in series their combined resistance is 15 ?. When they are connected in parallel, their combined resistance is 3.3 ?. What are the resistances of A and B?
A) 15 ? and 5 ? B) 5 ? and 10 ? C) 2.5 ? and 5 ? D) 32? and 20 ? E) 10 ? and 30?
Spectra for the Cygnus loop and the Orion nebula are shown above. Judging from their spectra, how would these two objects look to the naked eye (assuming they were bright enough for colors to be distinguished)?
A) The Cygnus loop would appear red, and the Orion nebula would appear blue. B) The Cygnus loop would appear red, and the Orion nebula would appear red. C) The Cygnus loop would appear blue, and the Orion nebula would appear blue. D) The Cygnus loop would appear blue, and the Orion nebula would appear red.
Evidence for the existence for Pangaea includes
a. biological evidence only. b. continuity of geologic features only. c. glacial evidence only. d. all of the above.
When an unstable W nucleus undergoes gamma decay, the nucleus formed is that of
a. W. b. Os. c. Ta. d. Hf. e. Re.