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Saturday, 11 March 2017

Nuclei - IV


Alpha Decay:

It is the process of emission of an a -particle from a radioactive nucleus. It may be represented as,
Beta Decay:
It is the process of emission of an electron from a radioactive nucleus. It may be
represented as,
Gamma Decay:
It is the process of emission of a g  -ray photon during the radioactive disintegration of a
nucleus. It can be represented as,

Radioactive Decay Law:
It states that the number of nuclei disintegrated of undecayed radioactive nuclei present at that instant. It may be written as

Where N(0) is the number of nuclei at t = 0 and l is disintegration constant.

Decay or disintegration Constant:

It may be defined as the reciprocal or the time interval in which the number of active nuclei in a given radioactive sample reduces to 36.8% of its initial value.

Half-life:
The half-life of a radioactive substance is the time in which one-half of its nuclei will disintegrate. It is inversely proportional to the decay constant of the radioactive substance.
Mean Life:
The mean-life of a radioactive sample is defined as the ratio of the combined age of all the atoms and the total number of atoms in the given sample. It is given by,

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