74 74 33As disintegrates to 32Ge in 68% of the cases, and to 34Se otherwise. T₁ for the 2 parent atoms is 17.9 d. a. What is the decay constant for 33 As? b. 74 What is the activity of a source containing 2.0 × 10¹7 atoms of 33As? Express in becquerels and in curies.

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