It means that each second, the wave disturbance moves 300 m.
The definition of wave speed is that a wave with a speed of 300 m/s means the wave disturbance moves 300 m every second.
Wave speed :
The amount of space a wave covers in a certain amount of time, such as the number of meters it covers in a second, is known as its wave speed. Speed = Wavelength x Frequency is an equation that describes how wave speed relates to wave wavelength and wave frequency. When the wavelength and frequency are known, this equation can be used to determine the wave speed.
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