![]() ![]() It is used to denote any shift towards lower frequencies, even for types of electromagnetic radiation where the frequencies do not correspond to any visible colour, and more generally still, for other types of waves as well (for instance for gravitational waves). Consequently, a shift towars higher frequences is called blueshift.įrom this, “redshift” has come to acquire a more general meaning. If the frequency of a light wave is shifted towards lower frequencies (for instance by the doppler shift), that corresponds to a colour shift towards the red end of the spectrum, and is hence called a redshift. For the lowest frequencies of visible light, that colour is red, light of the highest frequencies appears blue. redshift The frequency of a simple light wave is directly related to its colour (cf. The spectrum lists the composition of this mix: For every frequency, it states the amount of radiation energy contributed by waves of that particular frequency. spectrum The electromagnetic radiation reaching us from an astronomical object or other source is a mix of electromagnetic waves with a great variety of frequencies. Simple examples are water-waves - wave crests and troughs travelling over a water surface, and a Mexican wave in a football stadium, with fans alternately standing up and sitting down - the pattern moves throught the stadium, not the fans themselves.Īn especially simple form for a wave is a sinus wave, a regular pattern of wave crests and troughs. In a general sense: any travelling pattern, whether or not it involves matter being transported as well.
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