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Starting with a sample of pure .^(66)Cu,...

Starting with a sample of pure `.^(66)Cu, 7//8` of it decays into `Zn` in `15` minute. The corresponding half-life is:

A

10 min

B

15 min

C

5 min

D

`7(1)/(2)`min

Text Solution

Verified by Experts

The correct Answer is:
D
`n_(oo)=(A-A')/(4)=(200-168)/(4)=8`
`n_(beta)=2n_(alpha)-Z+Z'=2xx8-90+80=6`
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-ATOMS, MOLECULES AND NUCLEI -Exercise 1 (TOPICAL PROBLEMS)
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