Physics
The blue colour of water in the sea is due to

Scattering of blue light by water molecules
Reflection of blue light by impurities in sea water
Reflection of blue sky by sea water
Absorption of other colours except blue by water molecules

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

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