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After 10 Years, 75 G of an Original Sample of 100

Question 47

Multiple Choice

After 10 years, 75 g of an original sample of 100 g of a certain radioactive isotope has decayed.The half-life of the isotope is

A) 5 years.
B) 7.5 years.
C) 20 years.
D) 40 years.

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