Half-life period of a radioactive substance is `6 h`. After `24 h` activity is `0.01 muC`, what was the initial activity ?

Calculate the half life periode of a radioactive substance if its activity drops to 1/16 th of its initial value of 30 yr.

Calculate the half-life period of a radioactive substance, if its activity drops to 16^(th) of its initial value in 30 years.

What do you mean by half life period of a radio active substance ?

The half-life period of a radioactive element is 1 h. After 3 h, what fraction of it will remain?

The half life period of a radioactive substance is 15 minutes. What per cent of radioactivity of that material will remain after 45 minutes ?

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 )-