The half-life of radium is about `1600 yr`. Of `100g` of radium existing now, `25 g` will remain unchanged after

The half life of radium is about 1200 years.if hundred gram of radium is existing now than 25g will remain undecayed after

The half life of radium is about 1200 years.if hundred gram of radium is existing now than 25g will remain undecayed after

The half life of radium is 1600 years. The mean life of radium is

Half life of radium is 1600 years. Its average life:

The half-life of radium is 1600 years. After how many years 25 % of a radium block remains undecayed ?