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The wavelength of waves travelling with the same speed would  decrease if the frequency of the waves increases. This is because,  speed of a wave is the product of the dista â¦ nce of the wavelength  times the frequency of the wave.
Wave Speed. A wave is defined as a disturbance which is moved medium; for example, the wave of the ocean moves in medium water and we can see the movement of wave crest from one side to the other side in a given time period. The motion of objects is described in terms of speed which shows the fastness of the object.. Group Velocity: It is the velocity with which the amplitude of the wave travels in the medium. It is given by the formula; $V_{G}$=$\frac{d\omega}{dk}$. So, it can also be defined as the rate of change of the angular frequency of the wave with respect to the angular wave number of the wave.