A free `^238U` nucleus kept in a train emits an alpha particle. When the train
Channel: Doubtnut
Date: 2020-07-05

A free `^238U` nucleus kept in a train emits an alpha particle. When the train is stationary, a nucleus decays and a passenger measures that the separation between the alpha particle and the recoiling nucleus becomes x at time t after the decay. If the decay takes place while the train is moving at a uniform velocity v, the distance betwen the alpha particle and the recoiling nucleus at a time t after the decay as measured by the passenger is