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Physics Question

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發問:

Samples of two radioactive nuclides,A ande B,each have equal activity Ao at time t=0.A has a half-life of 9 years and B has a half-life of 15 years.The samples are mixed together. What will be the total activity of the mixture at t=45 years

最佳解答:

Consider A: No. of half-lives = 45/9 = 5 Activity = Ao(1/2)5 = 0.03125Ao Consider B: No. of half-lives = 45/15 = 3 Activity = Ao(1/2)3 = 0.125Ao Total activity = 0.03125Ao + 0.125Ao = 0.15625Ao

其他解答:

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