Modern in-air nuclear bomb tests have created an extra high level of 14C in our atmosphere
If future archaeologists date samples from this era, without knowing of this testing, will their carbon-14 dates be too young, too old, or correct? If correct, why? A) Too young.
B) Too old.
C) Correct, since 14C from bomb tests is different from that produced naturally.
D) Correct, because modern biological materials do not gather 14C from bomb tests.
A
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Which of the following polymers cannot be joined by fusion welding?
(a) PE (b) PVC (c) Epoxy (d) PTFE
A steam engine is operating at its theoretical maximum efficiency of 60%. If the waste heat has a temperature of 100°F (38°C), what is the temperature of the boiler?
A. 350°C B. 94°C C. 225°C D. 504°C E. 775°C
Star A has an absolute magnitude of 2.5 and star B has an apparent magnitude of 2.5, but star A is a main sequence star and star B is a red giant. Which statement below is correct?
A) Star A appears brighter than star B, but actually star B and star A are the same brightness. B) Star B appears brighter than star A, but actually star B and star A are the same brightness. C) Star A and star B appear to have the same brightness, but actually star B is brighter than star A. D) Star A and star B appear to have the same brightness, but actually star A is brighter than star B. E) It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above.
The metric prefix for one one-thousandth is
A) milli. B) centi. C) kilo. D) mega. E) giga.