How does the theory of inflation explain the near-uniformity of the cosmic microwave background?
A) Prior to rapid inflation, all regions of space were close enough to bounce radiation back-and-forth and reach the same temperature.
B) Matter expanded into regions of space that had no matter, and thus ended up at the same temperature.
C) The expanding universe would have cooled.
D) Matter was near the critical-density for a universal collapse, which smoothed out the differences in temperatures.
A
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Significant Figures: What is the quotient of 2.43 ÷ 4.561 expressed to the correct number of significant figures?
A. 5.3278 × 10-1 B. 5.328 × 10-1 C. 5.33 × 10-1 D. 5.3 × 10-1
The unit of electrical potential, the volt, is dimensionally equivalent to:
a. J/C. c. F×C. b. J×C. d. C/J.
Which of the following were found from Millikan's oil drop experiment?
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A current can be made to flow in a wire if
a. it is connected to a battery c. a magnet is put into motion near it b. it is put into motion near a magnet d. all of the above