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Updated on : 2022-09-05

Solution

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Correct option is C)

$N=N_{0}(21 )_{t/T_{1/2}}$

$∴30=240(21 )_{60/T_{1/2}}$

$[∵t=1h=60min]$

or $24030 =(21 )_{60/T_{1/2}}$

or $(21 )_{3}=(21 )_{60/T_{1/2}}$

Comparing the powers, we get

$∴T_{1/2}60 =3$

$T_{1/2}=360 $

or $T_{1/2}=20$min.

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