A 1-gram sample of wood is taken from an ancient site. If the Carbon-14 activity of the sample is 12.5% that of present-day organic material, what is the age of the wood? (T1/2 for 14C is 5730 years.)
a. 8600 years
c. 11,500 years
b. 4460 years
d. 17,200 years
D
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Series/Parallel Circuits: If V = 40 V and the battery is ideal, what is the potential difference across R1 in the figure?
A. 6.7 V B. 8.0 V C. 10 V D. 20 V
Stephen Hawking predicted that black holes can "evaporate" by emitting what we now call Hawking radiation. What does it mean for a black hole to "evaporate"?
A) The black hole loses its electric charge. B) The black hole's mass is gradually reduced. C) The black hole itself remains unchanged in mass, but it is able to send radiation out into the universe. D) Any matter that surrounds the black hole is heated to the point where it becomes a gas, if it wasn't already.
Although neutrino emission is used to detect supernovae, they do not play a role in the supernova explosion itself
a. True b. False Indicate whether the statement is true or false
A reasonable estimate for the height of the walls in an ordinary American home is
A) 10 m. B) 8 m. C) 2.5 m. D) 1.5 m.