The SI unit H (the henry) is equal to a
A. V/m.
B. V/A.
C. V·s.
D. V·s/A.
E. V·A/s.
D. V·s/A.
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A star can be a supernova
A) in predictable cycles of decades. B) a few times, at unpredictable intervals. C) only if it can fuse iron in its core. D) before it reaches the main sequence, if it is massive enough. E) only once.
According to the Big Bang model, most of the ________ in the Universe were formed ________.
A. hydrogen and helium; in the interior of massive stars B. hydrogen and helium; during supernova explosions C. heavy elements; during the first 3 minutes D. hydrogen and helium; during the first 3 minutes
Which of the following best summarizes what we mean by dark energy?
A) It is a name given to whatever is causing the expansion of the universe to accelerate with time. B) It is the energy contained in dark matter. C) It is the energy of black holes. D) It is a type of energy that is associated with the "dark side" of The Force that rules the cosmos.
Rainbows are caused by sunlight being
A) dispersed. B) dispersed, refracted, & reflected. C) refracted. D) reflected. E) refracted & reflected but not dispersed.