HCV: A free 238 U nucleus kept in a train emits an alpha particle. When the train is stationary, a
Channel: Ritesh Dahiya (RD Sir) (KDC) Kota Doubt Counter
Date: 12/09/2020

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 between the alpha particle and the recoiling nucleus at a time t after the decay as measured by the passenger is
 (a) x + v t
 (b) x – v t
 (c) x
 (d) depends on the direction of the train

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