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Speed of wave depends only on the medium. 1. Transverse wave on string: v T where T is the tension in the string, and is the mass per unit length of string. 2. Longitudinal wave in solid: v E where E is the Young modulus of solid, and is the density of solid. For sound wave in liquid, E is the bulk modulus of elasticity of the liquid. 3. Sound wave in gas: v P where P and are pressure and density of gas, and is the ratio of molar heat capacities of gas. is 5 3 for monatomic molecules like helium and neon; is 7 5 for diatomic molecules like hydrogen, oxygen and nitrogen. 4. Electromagnetic waves: v 1 where is the permitivity and is the permeability of the medium. relates to the electric field while relates to the magnetic field of waves. yck2-1/2006