Wave Transmission
Basic Definition
When a wave travels through the boundaries between two different mediums, the energy, wavespeed, and wavelength of the reflected and transmitted pulse change depending on the density of the two mediums.
How it works
When the wave travels between mediums, three things will mainly occur. First, depending on the which medium was more dense will determine whether the reflected pulse will be inverted. Secondly the second medium is more dense, the transmitted pulse will travel slower and it will have a smaller wavelength than the reflected pulse. Lastly, reverse will occur if the transmitted pulse is in the less dense medium and the reflected pulse is traveling through the more dense medium.
When a wave from a less dense medium travels through a more dense medium, the wave will not invert. This is because the very first particle of the less dense particle lacks the strength and power to overtake the more dense medium.