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RADIOACTIVE DECAY & HALF LIFE TIME...

RADIOACTIVE DECAY & HALF LIFE TIME

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Many unstable nuclie can decay spontaneously to a nucleus of lower mass but differnet combination of nucleons. The process of spontaneous emission of radiation is called radioactivity substance. Radioactive decay is a statistical process. Radiaactivity is independent of all external conditions. The number of decays per unit time or decay rate is called activity. Activity exponentially decrease with time. Mean lifetime is always greater than half-life time. If T_(H) is the half-life and T_(M) is the mean life. Which of the following statement is correct.

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Radioactive nucleus A decays into B with half-life 10sec . A also convert into C with half-life 100 sec . Find half-life of A for both emission.

Assertion In one half-life of a radioactive substance more number of nuclei are decayed than in one average life. Reason Average life = Half -life/in (2)

The decay constant of a radioactive sample is lamda. Its half -life is T_(1//2) and mean life is T.

Half–life of a radioactive substance A is 4 days. The probability that a nucleus will decay in two half– lives is

Half-life of a radioactive substance A is 4 days. The probability that a nuclear will decay in two half-lives is

Half-life of a radioactive substance is T. At time t_1 activity of a radioactive substance is R_1 and at time t_2 it is R_2 . Find the number of nuclei decayed in this interval of time.