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Carbon-14 undergoes beta decay with half-life 5730 yr. Suppose we know that an object originally had 2.0 x 1010 14C atoms in it, also given: 1 yr = 3.15 x 107 s, mass 14C = 14.003242 u, and mass 14N = 14.003074 u, and (1 u)c2 = 931.494 MeV

Q1. What is the total (kinetic) energy released in the beta decay reaction?

Q2. What is the disintegration rate?

Q3. What is the initial activity?

Q4. If the activity of the sample at a later time is 0.0510 Bq, then what period of time has elapsed?

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