An unstable particle "lives" for only about 10-20 seconds. Measurements of the rest energy, mc2, of this particle:
- will have a distribution that is of the order 30 eV wide.
- will have a distribution that is of the order 30 keV wide
- will have a distribution that is of the order 30 MeV wide
- cannot be made at all.
- will have a distribution that can be made arbitrarily small.
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