The half-life of a radioactive isotope is `3` hours. The value of its disintegration constant is

Fill in the blanks : The half life period of a radioactive substance is 69.3 years. The disintegration constant is …………

If the half-life of a radioactive sample is 10 hours its mean life is

If the half-life of a radioactive sample is 10 hours its mean life is

The half-life of a radioactive isotope is 2.5 hour. The mass of it that remains undecayed after 10 hour is (If the initial mass of the isotope was 16g).

If the half-life of a radioactive sample is 10 hours its mean life is ?

The half - life of a radioactive isotope is always. ………………………… .

The half - life of a radioactive isotope is always. ………………………… .