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The half-life of ${ }_{84}^{209} \mathrm{P}_0$ is 103 years. The time it takes for $100 \mathrm{~g}$ sample of ${ }_{84}^{209} \mathrm{P}_0$ to decay to 3.125 $\mathrm{g}$ is
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The correct answer is:
515 years
In one half life, half of amount is decayed.
So, decay occurs as
So, decay occurs as
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