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FÍSICA DO SÉCULO XX · b) Segundo a lei de desintegración radioactiva, 0 N N e= ⋅ −λ t: 24 0,231 30 21 30 0 30 3 10 3,02 10 átomos30 N N e N e N= ⋅ → = ⋅ ⋅ → =
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