Half life of a radioactive material is 3600 years. Calculate the average life

Half life of a radioactive material is 3600 years. Calculate the decay constant.

Half life of a radioactive sample depends upon

Define half life. 50% of a radioactive sample decays in 20 years. Find the half life and after how many years 75% of the material will decay.

Half life of radium is 1600 years. Calculate the time required during which 32 gram of radium reduces at 4 gram.