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A Sample Containing 4

Question 79

Multiple Choice

A sample containing 4.0 × 10¹⁸ atoms of a radioactive isotope decays with a half-life of 2.3 years.How many undecayed atoms are left after 3.7 years?

A) 2.5 × 10¹⁸
B) 1.7 × 10¹⁸
C) 1.3 × 10¹⁸
D) 1.1 × 10¹⁸

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