The half-life of radium is `1500 years`. In how many years will `1 g` of pure radium be reduced to one centigram?

The half life of radium is 1600 years. In how many years will one gram of pure radium be reduce to one centigram?

Half-life of radium is 1500 y. In how many years will 1 g of pure radium reduce by 1 mg ?

The half-life of radium is 1600 years. After how many years will one gram of the pure radium be reduced to one centigram?

The half life of radium is 1500 years. After how many years will one gram of pure radium (i) reduce to 1 centigram? (ii) lose one milligram?

The half-life of radium is 1500 years. After how many years will one gram of the pure radium (i) reduce to one centigram ? (ii) lose one milligram ?