explain the phrase the medium is the message
The medium is the message "The medium is the message" is a phrase coined by Marshall McLuhan meaning that the form of a medium embeds itself in any message it would transmit or convey, creating a symbiotic relationship by which the medium influences how the message is perceived.
Wavelength Localized wave packets, "bursts" of wave action where each wave packet travels as a unit, find application in many fields of physics. A wave packet has an envelope that describes the overall amplitude of the wave; within the envelope, the distance between adjacent peaks or troughs is sometimes called a local wavelength.[22][23] An example is shown in the figure. In general, the envelope of the wave packet moves at a different speed than the constituent waves.[24]