The distance between two consecutive points with phase difference of \(45^{\circ}\) in a wave of frequency \(300 \text{ Hz}\) is \(4.0 \text{ m}\). The velocity of the travelling wave is (in \( \text{km/s} \))
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A phase difference of $360^\circ$ ($2\pi$ radians) corresponds to a distance of one full wavelength ($\lambda$).