Physics
Which of the following represents a relation for ''heat lost = heat gained'?

Principle of thermal equilibrium
Principle of calorimetry
Principle of colors
Principle of vaporization

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

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

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