Question: Generally, more massive nuclides tend to be more unstable to alpha decay. For example, the most stable isotope of uranium, 238U, has an alpha decay

Generally, more massive nuclides tend to be more unstable to alpha decay. For example, the most stable isotope of uranium, 238U, has an alpha decay half-life of 4.5 x 109 y. The most stable isotope of plutonium is 244Pu with an 8.0 x 107 y half-life, and for curium we have 248Cm and 3.4 x 105y. When half of an original sample 238U has decayed, what fraction of the original sample of

(a) Plutonium and

(b) Curium is left?

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