Question

A radioactive sample has a half-life of $1500$ years. A sealed tube containing $1$ $g$ of the sample will contain after $3000$ years:

• A. $1$ $g$ of the sample
• B. $0.5$ $g$ of the sample
• C. $0.25$ $g$ of the sample
• D. $0.01$ $g$ of the sample

Answer 1

The correct option is C $0.25$ $g$ of the sample

3000 years is equal to 2 half -lives. After one half-life. amount left is $0.5g$. After second half life, amount left is $0.25g$.