Opts 2om OMedle 31 80 The radoactive isotope of lead, Pb-209, decays at a rate propotion answer to tee decmal alace...

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For edtoutie deeay ket Nve Nt And r deeay o 201 N 08N No e O-8No 0 -7 ,223 tyr O 2 23 3.3 br 0. 223 O693 1.061

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