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13.Nuclei
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તત્ત્વનો અર્ધઆયુ $20\, minutes$ છે,તો $33\%$ અને $67\%$ વિભંજન વચ્ચેનો સમય કેટલા ........... $minutes$ હશે?
A
$40$
B
$20$
C
$30$
D
$25$
Solution
Number of undecayed nuclei after $33\%$ decay = $0.67 \,N_0$
and number of undecayed nuclei after $67\%$ of decay = $0.33 \,N_0$
$(\because 0.33 \,N_0 \,\simeq – \,\frac{{0.67{N_0}}}{2}$ and in the half-life time the number of undecayed nuclei becomes half.$)$
Standard 12
Physics
