The fraction quantity of a radiactive sample will decay during half of its half-life period is

The fraction of the radioactive sample will remain undecayed after 4 half-life periods is

What fraction of a radioactive sample decay after three half lives?

Mean life of a radioactive sample is 100 seconds Then its half-life (in minutes) is

What fraction of a radiactive sample has decayed after two half-lives have elapsed?

The decay constant of a radioactive sample is lambda . The value of half life of average life of a radioactive sample are respectively given by