A subatomic particle created in an experiment exists in a certain state for a time of t = 7.4 10-20 s before decaying into

A subatomic particle created in an experiment exists in a certain state for a time of Δt = 7.4 × 10-20 s before decaying into other particles. Apply both the Heisenberg uncertainty principle and the equivalence of energy and mass (see Section 28.6) to determine the minimum uncertainty involved in measuring the mass of this short lived particle.