Assertion : If the half life of a radioactive | vedclass

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Half life of radioactive substance is $40\, days$. It means $50\%$ substance decays in $40\, days$. During this period rate of decay is on decrease. S

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If the Assertion is incorrect but the Reason is correct

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Half life of radioactive substance is $40\, days$. It means $50\%$ substance decays in $40\, days$. During this period rate of decay is on decrease. So, $25\%$ decay must have taken place is less than $20\, days$.

$N = {N_0}\,{\left( {\frac{1}{2}} \right)^n}$ , where $n = \frac{{{\rm{time\, elapsed}}}}{{{\rm{half \,life\, period}}}}$

Assertion : If the half life of a radioactive substance is $40\, days$ then $25\%$ substance decay in $20\, days$

Reason : $N = {N_0}\,{\left( {\frac{1}{2}} \right)^n}$

where, $n = \frac{{{\rm{time\, elapsed}}}}{{{\rm{half \,life \,period}}}}$

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Assertion : If the half life of a radioactive substance is $40\, days$ then $25\%$ substance decay in $20\, days$ Reason : $N = {N_0}\,{\left( {\frac{1}{2}} \right)^n}$ where, $n = \frac{{{\rm{time\, elapsed}}}}{{{\rm{half \,life \,period}}}}$