Question

If 8.0 g of a radioactive isotope has a half-life of 10 yr. The half-life of 2.0 g of the same substance is

• A. $2.5yr$
• B. $5yr$
• C. $20yr$
• D. $10yr$

Answer 1

Answer: (D)

Half-life is independent of initial amount, hence half-life of 2.0 g of substance is also 10 yr.