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.

Find the half-life period of a radioactive material if its activity drops of (1/16)^(th) of its initial value in 40 years.

Find the half-life period of a radioactive material if its activity drops of (1/16)^(th) of its initial value in 40 years.

Find the half-life period of a radioactive material if its activity drops of (1/16)^(th) of its initial value in 40 years.

The half-life period of a radioactive substance is 30 days. What is the time taken for 3/4 the of its original masss to disintegrate ?

The half life of a radioactive substance is 20s, the time taken for the sample to decay by 7//8^(th) of its initial value is

The half life of a radioactive substance is 20s, the time taken for the sample to decay by 7//8^(th) of its initial value is