Physics
Refrigeration is a process which

Kills bacteria
Plasmolyses the bacteria
Inactivates the bacteria
Slows down the bacterial growth

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

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