The Doppler effect and similar triangles

Abstract

The Euclidean version of Doppler effect will be explained using the properties of similar triangles. These properties will serve to explain the relationship between frequencies of propagated wavefronts, number of wavefronts and the time of emitting and receiving of these wavefronts. This explanation of Doppler effect represents not only a new method of obtaining equations which deal with Doppler effect, but using this geometric construction we will have an easier and deep understanding of some problems related to this effect, such as the general formulas of the Doppler effect and time Doppler effect, which are replaced by the new proposed formulas. Keywords: Similar triangles, Doppler effect, Relative velocity