A solar ________ is a sudden, violent disruption around sunspots, releasing a tremendous amount of energy in almost all wavelengths
A) flare B) aurora C) granule D) sunspot E) prominence
A
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Which is a unique geological feature found on Mercury's surface?
a. craters b. lobate scarps c. shield volcanoes d. sinuous rilles e. basins
Two bodies can be in thermal equilibrium with one another when they are at the same temperature even if they
A. absorb different quantities of thermal energy from their surroundings in equal time intervals. B. have different masses. C. have different volumes. D. have any of the properties listed above. E. have any of the properties listed above and one of them is contact with a third body at a different temperature.
The spectral sequence sorts stars according to
A) mass. B) surface temperature. C) luminosity. D) core temperature. E) radius.
A certain Carnot engine has Th = Tc + 35K, and an efficiency of 20.0%. What is Th?
A) 70.0 K B) 140 K C) 175 K D) 210 K E) 245 K