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.

Question

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The Answer of 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.

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