If the surface temperature of the Earth is 290 K and that of the Sun is 6 000 K, assuming the same emissivities, what is the ratio of the energy radiated per square meter of the Earth to that of the Sun?
a. 0.48 b. 2.3 × 10^–3
c. 6.4 × 10^–5 d. 5.5 × 10^–6
d
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Consider two circular loops sitting side by side on a tabletop, as shown in the top view below. Current flows as shown in the left loop but that current is decreasing. 
The current in the right loop flows in which direction?
A. Clockwise. B. Counterclockwise. C. No current flows in the right loop. D. One needs more information to answer.
Results from the Phoenix lander and Curiosity rover suggest that the positive result from the Viking Labeled Release experiment was probably due to
A) the destruction of organic molecules by oxygen released when perchlorates in the soil decomposed on heating B) terrestrial contamination from the robotic arm which took the samples C) a malfunction in the experiment D) high levels of radioactivity in the soil
How can you tell whether a sugar solution is saturated or not?
A) Add more sugar, if it dissolves, it is saturated. B) There will be a precipitate if the water is heated. C) Cool the solution to see if there is a precipitate. D) As long as there are more water molecules than sugar molecules, there is a saturated solution.