Because the factor h on the right side of the Heisenberg uncertainty principle has units of Joule-seconds, it suggests that the energy of a system also has uncertainty. The uncertainty in energy depends on the length of the time interval during which a system exists. Et> h/4Pi. Suppose an unstable mass is produced during a high-energy collision such that the uncertainty in its mass is me/100. (me = 9.11 x 10-31 kg.) How long will this particle exist