1.

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).

Answer»

10
5
2
1

Solution :`{:(._(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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