What is the primary topic of study in quantum mechanics?
A) the role played by atoms in astronomy
B) subatomic particles and the forces with which they interact
C) the mechanical movements of the heavens
D) the role of relativity in astronomy
B
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Greenhouse gases (water molecules and carbon dioxide) generate heat to make our Earth warm.
Answer the following statement true (T) or false (F)
Einstein's equivalence principle says that
A) everyone measures the speed of light to be equivalent. B) the effects of gravity are exactly equivalent to the effects of acceleration. C) someone traveling at 0.9c will age at the same rate as someone at 0.99c. D) all people see themselves at an equivalent distance to the center of the universe.
Which of the following processes is approximately reversible?
a) lighting a match b) pushing a block up a frictionless inclined plane c) frying an egg d) swimming across a pool e) stretching a spring by a small amount A. b only B. e only C. b, d and e D. b and e
Tritium is radioactive with a half-life of 12.33 years decaying into 3He with low-energy electron emission. If we have a sample of 2.35 × 10^19 tritium atoms, what is its activity in decays/second? (1 year = 3.16 × 10^7 s)
a. 6.64 × 10^7/second c. 3.69 × 10^8/second b. 5.35 × 10^9 /second d. 4.18 × 10^10/second