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Question
(a) What is the uncertainty in the energy released in the decay of a $\tau^-$ due to its short lifetime? (b) Is the uncertainty in this energy greater than or less than the uncertainty in the mass of the tau neutrino? Discuss the source of the uncertainty.
1. $1.1\times 10^{-3}\textrm{ eV}$
2. u

3. The uncertainty in energy is much less than the uncertainty in the mass of the tau neutrino.
Solution Video