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Wavelength of sound is denoted by the Greek word lamda.
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Lamda is a symbol in the Greek alphabet. In physics, represents nuclear half life, or the wavelength of a ray/ photon/ light.
It is used in the Half - Life games as the symbol for the rebellion. Also represents the game in general.

"C ( The Speed of Light) equals Lambda (Wavelength) times F (Frequency)."
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