Half-Life numerical | Useful for CSIR-NET, GATE, SET and other exams related to Physics 

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The questions discussed in this video listed below:
Question1 - Half-life of radium is 1620 years. Calculate the decay constant of radium?
Question2- The half-life of radium is 1600 yrs. After how many years 1Kg samples of radium will reduce to 1 gram?
Question3- A radioactive nuclide decays to form a stable nuclide. Its half-life is 3 minutes. What fraction of its 1 g will remain radioactive after 9 minutes?
Question4- Half-life of radium is 1600 yrs. If the mass at the beginning is 1 kg, what is the amount of radium after 4800 years?