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How do I solve for this question? (ignore the writing) Page S of 7 There are about 4 1016kg of present on Earth. The half-life

How do I solve for this question? (ignore the writing)

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Page S of 7 There are about 4 1016kg of present on Earth. The half-life is 4.47 109yr. It decays by emitting a 4.27 MeV alpha particle. (a) VVhat does it decay to? Circle one: 238 pa 238 Np 242 pu (b) How many kg were present 2 billion years ago? z 00000C(WO 234Th 60 (c) How many particles has all this uranium emitted in that time?

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