The half-time of a first order disintegration reaction, if 87.5% of the initial amount disintegrated in 90 minutes
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Explanation:
N=Noe^-λt
there one secret formula
N/No=(1/2)^n (here n is no. of disintegration)
here N=12.5 as 100-87.5 and No=100
125/1000=(1/2)^n
solving that n=3
n=time of decay/half life
half life=time of decay/n
Half life = 90/3=30 minutes
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Answer: The answer is 30 min
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