You double your distance from a sound source that is radiating equally in all directions. What happens to the intensity of the sound? It reduces to
A) one-half its original value.
B) one-fourth its original value.
C) one-sixteenth its original value.
D) none of the above
B
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What is the primary form of evidence that has led astronomers to conclude that the expansion of the universe is accelerating?
A) observations of the speeds of individual galaxies in clusters B) measurements of how galaxy speeds away from the Milky Way have increased during the past century C) observations of white dwarf supernovae D) measurements of the rotation curve for the universe
What is meant by Occam's Razor?
A) a well-designed experiment that clearly shows the differences between two competing theories B) a poorly designed experiment that fails to show the difference between two competing theories C) the idea that scientists should prefer the simpler of two models that agree equally well with observations D) the fine line between science and pseudoscience E) the shaving implement of a medieval scholar
The greatest redshifts yet observed for quasars is about
A) 0.1. B) 0.7. C) 1.4. D) 7.0. E) 14.0.
The fundamental components in the structure of the universe are the ______________
Fill in the blank(s) with correct word