An unstable nucleus within an ion-beam travels with velocity v = ? c where c =
3.00 × 108 m.s?1 and ? < 1.
As the ions travel they randomly undergo nuclear decay, emitting an ?-particle. On average they are observed to decay after traveling a distance of 6.20 m.
The same ions are brought to rest and held stationary in an ion-trap. The observed decay time of ions in the ion-trap is 10 ns.
What is the value of ?, where the velocity of the ion beam is v = ? c?