A radioactive material has mean lives of 1620 years and 660 years for a and emissions respectively The material decays by

Question

A radioactive material has mean lives of 1620 years and 660 years for a and emissions respectively The material decays by simultaneous a and emission The time in which of the 4 material remains intact is 1 4675 years 2 720 years 3 650 years 4 324 years

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