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A radioactive isotope `._(Z)X^(A)` is converting into `._(Z-8)Y^(A-16)` by `alpha`-decay. If g-atoms `._(Z)X^(A)` produced 3 mole of He atoms in 20 hours, then calculate the half life of `._(Z)X^(A)` (in hours).A. 10B. 5C. 2D. 1 |
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Answer» Correct Answer - A `{:(._(Z)X^(A)to,Y+,4_(2)^(4)He,),("1 mole",,"4 mol",),(1-x,,4x,),(,,4x=3,),(,,x=(3)/(4),):}` `K=(1)/(20)ln4` `t_(1//2)=(ln2)/((1)/(10)ln2)` `t_(1//2)=10" hrs. "]` |
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