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

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

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Physics
Mirage is due to:

Unequal heating of different parts of the atmosphere
Depletion of ozone layer in the atmosphere
Equal heating of different parts of the atmosphere
Magnetic disturbances in the atmosphere

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