The half life of radium is $1699$ years. Its average life is:

2308 y e a r s

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2450 y e a r s

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2500 y e a r s

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2700 y e a r s

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Solution

The correct option is B $2450 y e a r s$
$t_{1 / 2} = 1699 y r s$
Avg life $= t_{a v g} =$ $\frac{1}{λ} = \frac{1699}{0.693}$ $= 2451.6 y r s$

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