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Assertion. Average life of a radioactive element is that period in which 63% of it is decayed. Reason. Average life tau=1.44" t"_(1//2).

Answer»

If both assertion and REASON are true and the reason is the correct explanation of the assertion .
If both assertion and reason are true but reason is not the correct explanation of the assertion
If assertion is true but reason is false
If the assertion and reason both are false .

SOLUTION :The correct explanation to assertion is that quantity of radioactive substance DECAYED during its AVERAGE life is calculated by USING the expression
`lambda = (0.693)/(t_(1//2)) = (2.303)/(1.44 t_(1//2))` log `(100)/(N_(t))`.


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