Half life of a radioactive sample is `2x` years. What fraction of this sample will remain undecayed after `x` years?

Half life of a radioactive sample is 10days. What fraction of this sample will remain undecayed after 100days?

Tritium has a half-life of 12.5 years. What fraction of the sample will remain undecayed after 50 years?

Mean life of a radioactive sample is t_0 . What fraction of sample remains left after time t_0ln_2 ?

Mean life of a radioactive sample is t_0 . What fraction of sample remains left after time t_0ln_2 ?

Tritium has half life of 12.5 years undergoing beta decay. What fraction of sample of tritium will remain undecayed after 50 years?

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