A sample of radioactive substance loses half of its activity in 4 days. The time in which its activity is reduced to 5% is

A radioactive sample has a half-life of 4 years. Calculate the time in which the activity will be reduced to 25%.

A radioactive sample has a half-life of 20 years. The time at which the activity of the sample will reduce to 10% of its initial value is

The half-life of a radioactive substance is 3h and its activity is 1mu Ci . Then the activity after 9h will be (in mu Ci )-

The half-life of a radioactive substance is 3h and its activity is 1mu Ci . Then the activity after 9h will be (in mu Ci )-

A certain radioactive substance has half life period of 10 days. How long will it take for its activity to reduce to 1/8 of its original value ?

A radioactive substance decays to 1//32 th initial activity in 25 days.Calculate its half life.