If you want to cross a river in a motorboat in the least amount of time (least time in water), you should head
A) straight across the river.
B) slightly upstream.
C) slightly downstream.
D) the time will be independent of how you head your boat
E) directly downstream.
A
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Suppose the energy of the longest-wavelength photon emitted by an electron in a box of length L is Eph. What is the energy of the photon with the fourth-longest wavelength that might be emitted?
A. (4/3)Eph B. (5/3)Eph C. (7/3)Eph D. (8/3)Eph E. 3Eph
____________________ are groups of 100,000 to 1,000,000 population II stars firmly bound by gravity
Fill in the blank(s) with correct word
Compared to the entire electromagnetic spectrum, visible light is ________.
A. the least energetic B. the most energetic C. a small fraction of the possible wavelengths of light D. the most valuable to astronomers E. the fastest moving
Why were scientists surprised to find evidence of subsurface liquid water on Enceladus?
A) Enceladus was thought to be too far from the Sun to have a subsurface zone of liquid water. B) Enceladus was thought to be too small to have a subsurface zone of liquid water. C) Enceladus was not expected to have any water or ice in its composition. D) Scientists expect that Enceladus would have lost its liquid water to solar wind stripping by now.