Physics
What are the particles emitted by radioactive element after 3 consecutive disintegration?

2 beta 2 alpha
2 alpha 1 beta
2 beta 1 alpha
1 alpha 1 beta

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Physics
In a railway track, two rails are joined end to end with a gap in between them because

Accidents due to contraction in winter can be avoided
Air-gaps are necessary for bearing the weight of running train
Steel can be saved
Accidents due to expansion in summer can be avoided

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