During mean life of a radioactive element, the fraction that disintegrates is

What is mean life of a radioactive element?

The rate of decay of a radioactive element at t=0 instant 10^(3) disintegrations per second. If the half life of the elements is Is, then the rate of decay after Is will be

True or False Statements : In a radioactive element the fraction of initial amount remaining after its mean life time is l/e.

Half life of radioactive element is 100 yrs. The time in which it disintegrate 50% of its mass will be

Fill in the blanks with appropriate items : The half-life period of radioactive element _______ minute if 75% of it disintegrates in 40 min.

The half-life of a radioactive element is 10 h. The fraction of initial radioactivity of the clement that will remain after 40 h is,

Half life of a certain radioactive element is 3-465 days. Find its disintegration constant.