After a certain lapse of time , fraction of radioactive polonium undecayed is found to be 12.5 % of the initial quantity. What is the duration of this time lapse, if half-life of polonium is 139 days?

After a certain lapse of time, fraction of radioactive polonium undecayed is found to be 12.5% of the initial quantity. What is the duration of this time lapsed if the half life of polonium is 138 days?

After a certain lapse of time, fraction of radioactive polonium undecayed is found to be 12.5% of the initial quantity. What is the duration of this time lapsed if the half life of polonium is 138 days ?

After a certain lapse of time,the fraction of radioactive polonium undecayed is foud to be 12.5% of the initial quanitity.What is the duration of this time lapse,if the half life of polonium is 138 days?

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

Half life of a radioactive material is 24 hour and its initial quantity is 512 gram. After three days quantity of the radioactive material will be

Half life of a radioactive material is 24 hour and its initial quantity is 512 gram. After three days quantity of the radioactive material will be