Physics
Stationary wave is formed by

A transverse wave superposing a longitudinal wave
Two waves of same frequency travelling in the same direction
Two waves of the same speed superposing
Two waves of same frequency travelling in the opposite direction

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

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

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