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

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

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Physics
In a conductor

The valence band and the conduction band overlap each other
There is no conduction band
The forbidden energy gap is very narrow
The forbidden energy gap is very wide

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