The table below shows the initial and final masses of a radioactive material in a container. Initial mass (in kilograms) 0.8
Final mass (in kilograms) 0.05
Based on the table, which of these conclusions is correct?
The half life of the material is three years.
The half life of the material is four years.
The mass of the material was 0. 1 kilograms after four half lives.
The mass of the material was 0.1 kilograms after three half lives.​