If an elephant grows proportionally to twice its height, the area of its ears would be about
A) twice.
B) four times more.
C) six times more.
D) eight times more.
E) none of the above
Answer: B
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Unlike the ultraviolet photons originally emitted by the embedded stars of an emission nebula, the photons emitted by the recombination of electrons with atoms:
A) do not escape the nebula. B) escape the nebula. C) are re-absorbed by neutral hydrogen atoms. D) bounce around inside the nebula. E) are scattered by the dust particles.
Doubling both charges changes the potential energy for a pair of point charges by a factor of
A. 2. B. 4. C. 1?2. D. 1?4. E. 1 (no change).
Why did the discovery of Martian "blueberries" suggest the presence of water on Mars?
A. Plant life must have water to grow. B. They were found in an ancient seafloor on Mars. C. "Blueberries" on Earth form by the deposition of minerals in water. D. None of these choices is correct.
Why do rich clusters of galaxies contain a larger fraction of ellipticals than poor clusters or groups of galaxies?
What will be an ideal response?