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[" (3) "7.88Ci],[" 38A radioactive subst...

[" (3) "7.88Ci],[" 38A radioactive substance emits n beta particles in the "],[" first "2" seconds and "0.5" n beta particles in the next "],[2" seconds.Then mean life of the sample is? "],[[" s) "4s," (2) "2s," (3) "(2)/((1n2))" s ",(4)2(m2)" s "]]

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