MCQ
Free ${}^{238}U$ 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$x - vt$
- ✓$x$
- Ddepends on the direction of the train.
