The mean lives of a radioactive subtance are 1620 and 405 years for alpha -emission and beta -emission simultaneously, the time after which three fourth of sample will decay is nearly (x)/(2)xx(10)^(2) year, where x = ______ [take log_(10)^(4)=0.603 ]

The mean lives of a radioactive subtance are 1620 and 405 years for al

1.	The mean lives of a radioactive subtance are 1620 and 405 years for alpha -emission and beta -emission simultaneously, the time after which three fourth of sample will decay is nearly (x)/(2)xx(10)^(2) year, where x = ______ [take log_(10)^(4)=0.603 ]
Answer» 449.94 YEARS 323 years 350 years 329.68 years ANSWER :A

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The mean lives of a radioactive subtance are 1620 and 405 years for alpha -emission and beta -emission simultaneously, the time after which three fourth of sample will decay is nearly (x)/(2)xx(10)^(2) year, where x = ______ [take log_(10)^(4)=0.603 ]

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