At a certain elevation, the ________ , the air becomes saturated and water-vapor molecules ________
A) lifting condensation level; condense to mark the base of cloud formation
B) equilibrium level; condense to mark the base of cloud formation
C) lifting condensation level; stabilize and mark the upper limit of cloud formation
D) equilibrium level; stabilize and mark the upper limit of cloud formation
Answer: A
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What inevitably forces a star like the Sun to evolve away from being a main sequence star?
A) The core begins fusing iron. B) The star uses up all its supply of hydrogen. C) The carbon detonation explodes it as a type I supernova. D) Helium builds up in the core, while the hydrogen burning shell expands. E) The core loses all its neutrinos, so all fusion ceases.
With what color light would you expect to be able to see the greatest detail when using a microscope?
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A solar panel measures 80 cm × 50 cm. In direct sunlight, the panel delivers 4.8 A at 15 V. If the intensity of sunlight is 1000 W/m2, what is the efficiency of the solar panel in converting solar energy into electrical energy?
a. 12% c. 18% b. 24% d. 6.0%
How long between the evolution of single versus multicellular organisms?
A) 4.5 billion years B) 2.5 billion years C) one billion years D) 600 million years E) 63 million years