15
QuizMultiple Choice

Types of Radioactive Decay — Unit test

Question 15 • Crowley Original Credit Chemistry B

A sample contains 16.75 g of the radioisotope U-236 and 50.25 g of its daughter isotope, Th-232. How long did it take for decay to take place if one half-life of U-236 is 23 million years?

Answer
A
46 million years
B
69 million years
C
92 million years
D
115 million years
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A sample contains 16.75 g of the radioisotope…