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The velocity of a wave traveling through a cable is given by the formula ( v = \frac{1}{\sqrt{\mu \epsilon}} ), where ( \mu ) is the permeability of the medium and ( \epsilon ) is the permittivity of the medium. Given that the relative permittivity ( \epsilon_r = 9 ), the permittivity of the medium ( \epsilon ) can be calculated by ( \epsilon = \epsilon_0 \times \epsilon_r ), where ( \epsilon_0 ) is the permittivity of free space. By substituting the values of ( \mu ) and ( \epsilon ) into the formula, the velocity of the wave through the cable can be determined.

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