One half-life is the time required for one half of any given quantity of the substance to decay......
, which is the time required for one half of a given quantity of the substance to decay.
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It is the most energetic form of electromagnetic radiation, with a very short wavelength (high frequency)...... Gamma rays result from the transition of nuclei from excited states (higher energy) to their ground state (lowest energy), and their production is analogous to the emission of ordinary light caused by transitions of electrons within the atom (see atomspectrum,arrangement or display of light or other form of radiation separated according to wavelength, frequency, energy, or some other property.