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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.

How many atoms of are there in one tonne of the material. [10 pts]

After 48,000 years how many atoms of are there left? [5 pts]

How much energy in Joules has been released in the radioactive decays of the plutonium. [10 pts]

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