Q. 18

Free 238</su A. x + vt

B. x – vt

C. x

D. depends on the direction of the train.

Answer :

The separation between the alpha particle and the recoiling nucleus is measured as x in time t when uranium atom is kept in a stationary train. If decay takes place in a moving train, the distance between the alpha particle and the recoiling nucleus is now measured, will remain x in time t. This is because the decay process and the passenger are in same time frame.

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