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Cobalt-60 (t1/2= 5.26 y) undergoes beta decay. (a) How many beta particles are emitted in 45.5...

Cobalt-60 (t1/2= 5.26 y) undergoes beta decay. (a) How many beta particles are emitted in 45.5 s in a 2.44 mg sample? (b) Determine the activity in SI units and Ci.

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