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  Radioactivity

Radioactivity:

The phenomenon of spontaneous disintegration of some atomic nuclei resultant in the emission of radioactive rays is termed as radioactivity.

Radioactivity is a nuclear phenomenon and it is not exaggerated by external factors like pressure, temperature, and so on. This phenomenon was introduced by Henry Becqurel.

To elucidate the spontaneous decay of radioactive elements, Rutherford and Soddy place forward the theory of radioactive disintegration. According to this theory the amount of radioactive element that disappears in unit time is directly proportional to the quantity (i.e., atoms) of radioactive substance present at that time.

 

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Based on the said theory, the following equation is derived that confirms that all radioactive reactions obey I order:

t = (2.303/ λ) log (No/N)

Here,
λ = decay constant
N0 = Number of radioactive atoms present primarily
N = Number of radioactive atoms at time‘t’

 

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