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The mean lives of a radioactive substanc...

The mean lives of a radioactive substance are 1620 years and 405 years 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 simultaneously. `(log_e4=1.386).`

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The mean lives of a radioactive substance are 1620 years and 405 years of 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 simultaneously.

The mean lives of a radioactive substance are 1620 years and 405 years of 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 simultaneously.