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In: Physics

a)A reliable energy source during long space flights can be in the form of radioactive material....

a)A reliable energy source during long space flights can be in the form of radioactive material. One nuclide that has been used is 94238Pu which decays by α-decay. The half-life is 87.7 years. After how long time has the power changed from 5 kW to 4 kW?

b) What are the differences between positron, electron, and proton? Discuss.

c) What do you understand from photoelectric and Compton scattering interactions? Discuss.

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