The evolution of the distribution of dark and normal matter were____
a. both controlled by large differences in the cosmic microwave background radiation
b. different because dark matter does not interact with electromagnetic forces
c. different because dark matter does not interact with gravitational forces
d. different because dark matter does not interact with weak nuclear forces
e. different because dark matter does not interact with strong nuclear forces
b
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An 80-eV electron impinges upon a potential barrier 100 eV high and 0.20 nm thick
What is the probability the electron will tunnel through the barrier? (1 eV = 1.60 × 10-19 J, mproton = 1.67 × 10-27 kg, h = 1.055 × 10-34 J ? s, h = 6.626 × 10-34 J ? s) A) 0.011% B) 1.1% C) 0.11% D) 1.1 × 10-4 % E) 7.7 × 10-10 %
(Do not try the following: it could kill you. This question is only about a hypothetical possibility.) If you were standing below an object emitting a fixed frequency sound falling at terminal velocity, as it approached you, you would hear the sound
a. drop in frequency. b. stay at the same frequency. c. increase in frequency. d. decrease in loudness. e. stay at the same loudness.
Astronomers believe that some of the abundant water on Earth arrived late in the formation process as a bombardment of _______________
Fill in the blank(s) with correct word
Water being purified using aluminum salts and a base is an example of
A) a physical separation. B) a chemical reaction. C) an acid-base reaction. D) a chemical separation. E) none of the above