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

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

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Physics
What is the principle of a ''Life Jacket"?

It increases the volume of the person to keep him afloat
It provides oxygen to a drowning person
It decreases the volume of the person to keep him afloat
The person can sit on it like a raft

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