## Answers

A = d.N Activity = 0.693 tie = 32.76 years ty ty2 = 1:0331x109 seconds 6 4x10 moles ý hopes. W = 4x100 23 x 6.022x10 231 A=0.693 1:0331 8109 4x lot 23 x 6.022x10 231 14- A = 6.9950108 Bq.]= 10 1 c = 3.7810 Bq [A = 6.995 X108 1.89x108 3-7x1010 ci 47 years Activity After = 6.693 per year. 32.76 to e at 132.16 0.693 x 47 ) A = 1.89x108. e 6.99x107 ] 14 닌

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