Type la SN:
a) Given a total radiated energy of 10^{50} erg, and that the energy entirely comes from Ni to Fe decay, determine the amount of Ni mass (in units of M_{sun}) required.
b) How long does it take for the luminosity to drop by a factor of 10 during the phase that Co decay dominates the luminosity?
c) does the luminosity drop more quickly or more slowly when the supernova becomes optically thin to Co decay radiation?
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