Energy Levels: In making a transition from state n = 1 to state n = 2, the hydrogen atom must
A. absorb a photon of energy 10.2 eV.
B. emit a photon of energy 10.2 eV.
C. absorb a photon of energy 13.58 eV.
D. emit a photon of energy 13.58 eV.
Answer: A
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The fossil fuel deposits we use today are the remains of organisms from which period in Earth's history?
A) The Cretaceous Period B) The Carboniferous Period C) The Cambrian Period D) The Archaean Eon
Why does Jupiter have several distinct cloud layers?
A) Different gases are present at different altitudes in Jupiter's atmosphere. B) Clouds form randomly, so on average there are always several layers. C) Different layers represent the various regions where the temperature is cool enough for liquid water to condense. D) Winds prevent clouds from forming at some altitudes, so we see clouds only at the other altitudes. E) Different layers represent clouds made of gases that condense at different temperatures.
An electric generating plant produces 400 MW of electric power while operating at 40% efficiency. The rate at which this plant consumes energy [in the form of the thermal energy obtained by burning the coal that is fed into the plant] is
A) 160 MW. B) 600 MW. C) 240 MW. D) 1000 MW. E) 1400 MW.
During each cycle of operation, a refrigerator absorbs 230 J of heat from the freezer and expels 356 J of heat to the room. How much work input is required in each cycle?
A) 712 J B) 586 J C) 460 J D) 126 J