An atomic mass unit (amu) is 1/12 the mass of
A) an electron.
B) a proton.
C) a hydrogen atom.
D) a carbon atom.
E) a uranium atom.
Answer: D
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Kepler's first law of planetary motion defied what long-held belief with ancient astronomers?
a. a heliocentric Universe b. a geocentric Universe c. uniform circular motion d. parallax of newborn stars e. perfection of the heavens
Which of the following nuclear reactions is forbidden?
A. 
B. 
C. 
D. 
Photons of red light cause a surface to emit photoelectrons with maximum kinetic energy K(red). If photons of blue light of the same intensity are now used in the experiment, which of the following statements is true about the photoelectrons emitted (if any are emitted)?
A. no photoelectrons are emitted B. maximum K(blue) < K(red) C. maximum K(blue) = K(red) D. maximum K(blue) > K(red) E. none of these choices are true
Which stage of planetary development has all but eliminated much of Earth's surface history?
a. flooding b. cratering c. differentiation d. bombardment e. slow surface evolution