At a pressure of 1 atmosphere, a mixture of two metals (A and B) has the two phases ? and ? equilibrium at the selected temperature (T). Can the chemical composition of the ? phase be changed by adding more A-type atoms at temperature (T)? _____________
Fill in the blank(s) with the appropriate word(s).
No
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The radioactivity due to carbon-14 measured in a piece of a wooden casket from an ancient burial site was found to produce 20 counts per minute from a given sample, whereas the same amount of carbon from a piece of living wood produced 160
counts per minute. The half-life of carbon-14, a beta emitter, is 5730 years. Thus we would estimate the age of the artifact to be about A) 5,700 years. B) 11,500 years. C) 14,800 years. D) 17,200 years. E) 23,000 years.
The mass of a neutron star is
a. several time that of the Sun. b. about the same as that of the Sun. c. about the same as Earth. d. smaller than any of these.
The escape velocity at the event horizon around a black hole is
a. smaller than the speed of light. b. equal to the speed of light. c. much larger than the speed of light. d. irrelevant since nothing (including light) can escape from a black hole.
When a planet retrogrades, it appears to move westward
Indicate whether the statement is true or false