The number fo radioactive atoms of a radio isotope fails to `12.5%` in 27 day. Calcualate the half-life of isotope.

The activity of a radioactive isotope falls to 12.5% in 90 days. Calculate the half life and decay constant.

The activity of a radioactive isotope falls to 12.5% in 90 days. Calculate the half life and decay constant.

The activity of a radioactive isotope falls to 12.5% in 90 days. Calculate the half life and decay constant.

The activity of a radioactive isotope falls to 12.5% in 90 days. Calculate the half life and decay constant.

The activity of a radioactive isotope falls to 12.5% in 90 days. Compute the half life and decay constatn of isotope.

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

After a period of 100 days the radioactive of an isotope remains 1/4th of the original activity . The half life of the isotope is