0th, 2nd order reactions and half-life???

[orangeblossom]

I know nuclear decay reactions are first order reactions. Are they always first order reactions?

If so, then what does all this mean? For 0th order reactions, the half-life is proportional to the concentration of compound; for 2nd order reactions, half life is indirectly proportional to concentration of compound.

EDIT: nvm, i figured it out

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