1. Phosphorous - 32 has a half - life of 14 days.  After how many days will a 1000 mg sample decay to 62.5 mg? A. 14                B.  28                 C.  42                           D.  56 2. The radioactive disintegration of an atom of  14 c 8 yields 14n 7 What is the second product? A. alpha particle   B.  beta particle       C.  neutron       D.  positron

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