The interior of Earth is very hot because of ________.
A. the radioactive decay of elements
B. internal combustion
C. oxidation
D. fusion reactions
Answer: A
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Power: What is the resistance of a 0.100-kW light bulb designed to be used in a 120-V circuit dc?
A. 12.0 ? B. 144 ? C. 1.2 ? D. 0.83 ?
Energy Levels: A hydrogen atom makes a downward transition from the n = 15 state to the n = 5 state. Find the wavelength of the emitted photon. (c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 2.56 ?m B. 1.54 ?m C. 2.05 ?m D. 3.07 ?m
Most of the Moon's surface is densely covered with craters, but we find relatively few craters within the lunar maria. What can we conclude?
A) The maria formed after the heavy bombardment ended. B) The maria formed within the past 1 billion years. C) The regions of the maria were hit by fewer impacts than the densely cratered regions. D) Erosion affects the maria more than it affects other regions of the Moon.
Stromatolites date back to approximately
A) 4.6 billion years ago B) 3.5 billion years ago C) 3.85 billion years ago D) 4.0 billion years ago