Radionuclide A has a half-life that is one-half that of radionuclide B.The decay rate constant of A is _____that of B.

Name: Radionuclide A has a half-life that is one-half that of radionuclide B.The decay rate constant of A is _____that of B.
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The decay rate constant ($k$) is inversely proportional to the half-life ($t_{1/2}$). If radionuclide A has a half-life that is one-half that of B, its decay rate constant is twice that of B, because $k = \ln(2) / t_{1/2}$.

Radionuclide a Has a Half-Life That Is One-Half That of Radionuclide