In most cases, when wave refract, frequency and amplitude will be constant while wavelength and speed will change.
The four properties of waves are:
When a wave moves from one medium to another, the wave will undergo refraction.
When a wave move for instance, from water to glass, the wave will refract by changing direction. In most scenario, the frequency of the wave will be constant while the wavelength of the wave will change. Since the wavelength will change, the speed will also change.
Therefore, when a wave moves from one medium to another, the properties of the wave that change are wavelength and wave speed.
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