Calcium-47, a beta emitter, has a half-life of 4.5 days.
a. Write the balanced nuclear equation for the beta decay of calcium-47.
b. How many milligrams of a 16-mg sample of calcium-47 remain after 18 days?
c. How many days have passed if 4.8 mg of calcium-47 decayed to 1.2 mg of calcium-47?
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