Question

$10$ gram of radioactive material of half-life $15$ years is kept in a box for $20$ years. The disintegrated material is :

• A. $10.2g$
• B. $6.03g$
• C. $4.03g$
• D. $12.6g$

Answer 1

The correct option is B $6.03g$

(B) is correct option.