After two hours, one-sixteenth of tge starting amount if a certain radioactive isotope remained undecayed. The half-life of the isotope is

After two hours, one sixteenth of the starting amount of a certain radioactive isotope remained undecayed. The half-life of the isotope is

After two hours 1//6 th of the initial amount of a certain radioactive isotope remains undecayed. The half life of the isotope is :

After 1 hour, 1/8 of the initial mass of a certain radio active isotope remains undecayed. The half-life of the isotope is

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

After 24 hour, only 0.125" g" out of the initial quantity of 1 g of a radioactive isotope remains behind. The half-life period of the radioactive isotope in hours is

10 g of a radioactive isotope is reduced to 1.25 g in 12 years. Therefore half-life period of the isotope is