An isotope decays to `1//16^(th)` of its mass in 1h. What is the half-life period of the isotope?

A radioactive substance decays to 1//16^(th) of its initial mass in 40 days. The half life of the substance, in days, is :

A radioactive substance decays to 1/16 th of its initial mass in 40 days. The half life of the substance, in days, is?

A radioactive substance decays to 1/16 th of the initial mass in 40 days. The half life of the substance is….. Day.

10 g of a radioactive isotope is reduced to 1.25 g in 12 years. Therefore half-life period of the isotope is

8 g of the radioactive isotope, cesium-137 were collected on Feb. 1 and kept in a sealed tube. On July 1, it was found that only 0.25 g of it remained. So the half life period of the isotope is: