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The mean lives of radioactive substance ...

The mean lives of radioactive substance are 1620 year and 405 year for `alpha-` emission and `beta-` emission respectively. Find out the time during which three fourth of a sample will decay, if it is decaying both by `alpha-` emission and `beta-` emission simulaneously.

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The correct Answer is:
`449.24` year
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P BAHADUR-RADIO ACTIVITY-Exercies 9
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