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Plutonium-239 has a half-life of 24,000 years and an atomic mass of 239.05 u. When it...

Plutonium-239 has a half-life of 24,000 years and an atomic mass of 239.05 u. When it decays to Uranium-235 an alpha particle with an energy of 5.2 MeV is released.

a. How many atoms of are there in one tonne of the materia

b. After 48,000 years how many atoms of are there left?

c. How much energy in Joules has been released in the radioactive decays of the plutonium

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