an instructor buys a 10-microcurie (10 = Ci) Cs-137source for laboratory experim

Question

an instructor buys a 10-microcurie (10 = Ci) Cs-137source for laboratory experiments. after 5 years what is (a) the strength of the source in Ci (b) the activity of the source in disintegrations per second?[1 curie (Ci) = 3 x 1010 disintegrations]
(c) what is the strength of the source in becquerels (Bq) ? ) thebecquerel is the official SI unit, 1 Ci=      3.7x 1010 Bq an instructor buys a 10-microcurie (10 = Ci) Cs-137source for laboratory experiments. after 5 years what is (a) the strength of the source in Ci (b) the activity of the source in disintegrations per second?[1 curie (Ci) = 3 x 1010 disintegrations]
(c) what is the strength of the source in becquerels (Bq) ? ) thebecquerel is the official SI unit, 1 Ci=      3.7x 1010 Bq

Explanation / Answer

if Ao be intial activity and if A be the activity aftera time interval ' t '                 A = Ao e^-t =0.693/ T 1/2    T 1/2 = half life of Cs       t = time interval .           plugging in the knwon values in the above equation we can solvefor       present activity ' A ' .        T 1/2 = half life of Cs       t = time interval .           plugging in the knwon values in the above equation we can solvefor       present activity ' A ' .    

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