The proper order of the layers of a generic atmosphere from lowest altitude to highest is
A) troposphere, stratosphere, exosphere, thermosphere.
B) troposphere, stratosphere, thermosphere, exosphere.
C) stratosphere, troposphere, exosphere, thermosphere.
D) stratosphere, troposphere, thermosphere, exosphere.
E) none of the above
B
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What is the approximate volume of an adult human’s head.
A. 0.1 
B. 0.001
C. 0.005
D. 0.01
E. 0.05
The cosmic background radiation appears compatible with a blackbody source at what temperature?
a. 0.000 3 K b. 0.03 K c. 3 K d. 300 K
In the theory of cosmic inflation, what is it that experiences a large rapid increase?
A) the mass of the universe B) the size of the universe C) the net [or total] energy of the universe D) the temperature of the universe E) All of the above.
The half-life of radioactive Technetium-99 is 6.0 hours. Find the number of 99Tc nuclei necessary to produce a sample of activity 1.9 µCi. (1 Ci = 3.7 × 10^10 decays/second)
a. 5.9E–2 b. 2.2E+9 c. 1.5E+9 d. 6.1E+5 e. 4.2E+5