Created by StemPy LabA radioactive source has an activity of Bq and a half-life of h. How many radioactive nuclei does it contain?
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← Thorium-232 has an atomic mass of 232.038055 u. It decays by alpha emission into radium-228, which has an atomic mass of 228.031070 u. A helium-4 atom has 4.002603 u. Use 1 u = 931.494 MeV/c². How much energy is released in the decay?A nucleus can decay in two ways. By one way alone its half-life would be 10 min, and by the other way alone 40 min. What is its half-life when both ways act? →
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