The mean lives of a radioactive substance are 1620yr and 405yr for α-emission and β-emission, respectively. Find out the time during which three-fourth of a sample will decay, if it is decaying both by α-emission and β-emission simultaneously.
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The mean lives of a radioactive substance are 1620 year and 405 year for α-emission and β-emission respectively. The time (in year) during which three fourth of a sample will decay if it is decaying both by α-emission and β-emission simultaneously is (divide answer by 200 and write the nearest integer).
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mean lives of a radioactive queen of the African
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