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An element, X has an atomic number 41 and a atomic mass of 132.790 u.
This element is unstable and decays by decay, with a half life of
54d. The beta particle is emitted with a kinetic energy of
11.86MeV. Initially there are 9.90×10¹2 atoms present in a sample.
Determine the activity of the sample after 118 days (in Ci ).

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