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Starting with a sample of pure $C u^{66}, 7 / 8$ part of sample decay’s into Zn in 21 minutes. The corresponding mean-life is

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Correct option is B

If 78 part decayed, then remaining sample is 18. Decay Law, NN0=12tt12 ⇒18=12tt12 ⇒123=12tt12 ⇒3=tt12 ⇒t12=213min=7min Now, Mean Life= Half lifeln2=70.693=10.10 min

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Starting with a sample of pure Cu66,7/8 part of sample decay’s into Zn in 21 minutes. The corresponding mean-life is

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Starting with a sample of pure $C u^{66}, 7 / 8$ part of sample decay’s into Zn in 21 minutes. The corresponding mean-life is