Physics
The quality or tone of a musical sound produced by a stringed instrument depends on

Length of the strings in the instrument
Amplitude of vibration
Wave form of the sound
Frequency of vibration

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

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

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