The time required for radioactive nuclei to disintegrate to half of its original number of nuclei is called

In one half- life time duration activity of a sample reduced to half of its initial value. total number of nuclei present are reduced to half of its initial value. number of radioactive nuclei present is reduced to half of its initial value mass of sample is reduced to half of its initial value Out of these, correct statements are

In a sample of radioactive material , what fraction of the initial number of active nuclei will remain undisintegrated after half of the half life of the sample ?

A large population of radioactive nucleus starts disintegrating at t=0 .At time t, if N= number of parent nuclei present, D= the number of daughter nuclei present and R= rate at which the daughter nuclei are produced , then the correct representation will be:

If N_(0) is the number of radioactive nuclei initially present , then the number of nuclei remaining undecayed at the end of nth half life is

The half life of a certain radio isotope is 10 minutes. The number of radioactive nuclei at a given instant of time is 10^(8) Then the number of radioactive nuclei left 5 minutes later would be:

In a sample of radioactive material, what fraction of initial number of active nuclei will remain undistintegrated after half of a half0life of the sample?

At a given instant there are 25% undecayed radioactive nuclei in a sample. After 10 s the number of undecayed nuclei reduces to 12.5%. Calculate (a) mean life of the nuclei, (b) the time in which the number of undecayed nuclei will further reduce to 6.25% of the reduced number.

A radioactive substance has 6.0xx10^(18) active nuclei initially. What time is required for the active nuclei of the same substance to become 1.0xx10^(18) if its half-life is 40s .

A radioactive element is disintegrating having half-life 6.93 s. The fractional change in number of nuclei of the radioactive element during 10 s is