Living matter has 1.3 × 10-10 % of its carbon in the form of 14C which has a half-life of 5730 y. A mammoth bone has a 300-g sample of carbon separated from it, and the sample is found to have an activity of 20 decays per second
How old is the bone?
A) 15,000 y B) 7600 y C) 11,500 y D) 6400 y E) 10,900 y
E
Physics & Space Science
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Magnetic particle inspection can detect only _________cracks.
Fill in the blank(s) with the appropriate word(s).
Physics & Space Science
Georges-Louis de Buffon was the first to propose that the Sun and planets formed when a large vortex contracted and condensed
a. True b. False Indicate whether the statement is true or false
Physics & Space Science
Which of the following species is undergoing reduction?
2 CuBr ? 2Cu + Br2 A) Cu B) CuBr C) Cu+ D) Br- E) Br2
Physics & Space Science
The diameter of a circle is doubled. By what factor is the area changed?
A. 
B. 2
C. 4
D. 
E. 1
Physics & Space Science