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LaGrange's Mean Value theorem

The average l...

Question

The average life(in days) of $U^{238}$ having $t_{0.5} = 138.5$ days is. (write the value to the nearest integer)

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Solution

Average life $= \frac{1}{K} = \frac{t_{1 / 2}}{0.693} = \frac{138.5}{0.693} = 199.86$ days

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