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Free 238U nuclei kept in a train emit alpha particles. When the train is stationary and a uranium nucleus decays, a passenger measures that the separation between the alpha particle and the recoiling nucleus becomes x in time t after the decay. If a decay takes place when the train is moving at a uniform speed v, the distance between the alpha particle and the recoiling nucleus at a time t after the decay, as measured by the passenger will be (a) x + vt (b) x - vt (c) x (d) depends on the direction of the train. |
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Answer» (c) x. Explanation: In both of the cases the frame of reference is inertial so with reference to the frame of train the separation too will be equal. |
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