It is observed that only 6.25% of a given radioactive sample is left undecayed after a period of 16 days. What is the decay constant of this sample in `day^-1`?

It is observed that only 0.39% of the original radioactive sample remains undecayed after eight hours.Hence:

It is observerd that only 0.39% of the original radioactive sample remains undecayed after eight hours. Hence,

It is observerd that only 0.39% of the original radioactive sample remains undecayed after eight hours. Hence,

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

90% of a radioactive sample is left undecayed after time t has elapesed. What percentage of the initial sample will decay in a total time 2 t ?

90% of a radioactive sample is left undecayed after time t has elapesed. What percentage of the initial sample will decay in a total time 2 t ?

In a given radioactive sample, it is observed that after 415.8 days, 12.5% of the initial sample remains undecayed. Calculate the mean life and decay constant of this sample.

A radioactive sample is decayed 20% in one day. After next two days, the undecayed percentage of nuclei will be