Question:

The activity of ratio altitude (X100) ({{X}^{100}}) is 6.023 curie. If its disintegration constant is 3.7×104sec1, 3.7\times {{10}^{4}}{{\sec }^{-1}}, the mass of X is :

Updated On: Apr 4, 2024
  • 1023g {{10}^{-23}}g
  • 1015g {{10}^{-15}}g
  • 1016g {{10}^{-16}}g
  • 1014g {{10}^{-14}}g
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The Correct Option is B

Solution and Explanation

We know that 1 Curie 3.7  ×  1010 3.7\,\,\times \,\,{{10}^{10}} disintegration per sec So, activity =6.023×3.7×1010dps =6.023\times 3.7\times {{10}^{10}}\,\text{dps} λ=3.7×1014sec1 \lambda =3.7\times {{10}^{14}}\,{{\sec }^{-1}} N=Activityλ=6.023×3.7×10103.7×104 N=\frac{Activity}{\lambda }=\frac{6.023\times 3.7\times {{10}^{-10}}}{3.7\times {{10}^{4}}} =6.023×106atoms =6.023\times {{10}^{6}}\text{atoms} \because Weight of 6.023×1023 6.023\times {{10}^{23}} atoms = 100 g \therefore Weight of 6.023×106 6.023\times {{10}^{6}} atoms will be =100×6.023×1066.023×1023=1015g =\frac{100\times 6.023\times {{10}^{6}}}{6.023\times {{10}^{23}}}={{10}^{-15}}\,g
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