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JEEMAIN and NEET
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JEEMAIN PAST PAPERS
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2005
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Q)
Starting with a sample of pure $^{66}Cu, 7/8$ of it decays into Zn in 15 min. The corresponding half life is :
( A ) 7$\frac{1}{2}$ min
( B ) 5 min
( C ) 15 min
( D ) 10 min
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