A sample of a radioactive element has a mass of `10 g` at an instant `t=0`. The approxiamte mass of this element in the sample after two mean lives is .

A sample of a radioactive element has a mass of 10 g at an instant t=0. The approximate mass of this element in the sample left after two mean lives is

A sample of a radioactive element has a mass of 10 g at an instant t=0. The approximate mass of this element in the sample left after two mean lives is

A sample of radioactive element has a mass of 10 g at an instant t=0 . The approximate mass of this element in the sample after two mean lives is

A sample of radioactive element has a mass of 10 g at an instant t=0 . The approximate mass of this element in the sample after two mean lives is

A 10 g sample of radioactive sample is present at t= 0. The approximate mass of this element in the sample after two mean life is :

A box contains a radioactive material of mass 14.58 gram at time t=0. What is the mass ofo the element left in the box after a time of 2 mean lives ? (take e=2.7)

The half-life of a radioactive element is 2h. If its initial mass be 5 g., then determine the residual mass of the element after 10 h.

The mean life of a radioactive element is 13 days. Initially a sample contains 1 g of this element . The mass of the element will be 0.5 g after a time of

A certain radioactive element has a half-life of 20 years . If we have a block with 10 g of the element in it, after how