Velocity of Longitudinal Waves

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zorro
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Does the formula for velocity of the wave = wavelength * frequency hold true for longitudinal waves (like sound wave) also? If yes then we don't find the velocity of sound by any such formula. Moreover, is the wavelength and frequency defined for longitudinal waves?
 

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Why is the velocity of sound in solids given by v = √(Y/ρ) ?
 

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