Physics
Beta rays emitted by a radioactive material are

Charged particles emitted by nucleus
Neutral particles
Electromagnetic radiations
The electrons orbiting around the nucleus

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Physics
A metal ball and a rubber ball, both having the same mass, strike a wall normally with the same velocity. The rubber ball rebounds and the metal ball does not rebound. It can be concluded that

The initial momentum of the rubber ball is greater than that of the metal ball
The metal ball suffers greater change in momentum
The rubber ball suffers greater change in momentum
Both suffer the same change in momentum

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