The Doppler Effect Essay - 487 Words

The Doppler Effect Christian Johann Doppler, born November 29, 1803 in Salzburg, Austria died March 17, 1853 in Venice. Christian Doppler an Austrian Physicist who first described how the detected frequency of light and sound waves is affected by the relative motion of the source and the detector. This aspect became known as the Doppler Effect. Christian was educated at the Polytechnical Institute in Vienna. Doppler became director of the physical Institute and professor of experimental physics of the University of Vienna in 1850. In 1842 he published Uber das farbige Licht der Dopperlsterne which means Concerning the Coloured Light of Double Stars, which contained his first statement of the Doppler effect. He then†¦show more content†¦And if the light is moving towards you then the light becomes bigger, and brighter. Another example of this is if you ever drove in a car at night you can see a car from far away but the headlights of the other car look like they are more seperated apart. And as the vehicle moves closer to you, the lights seem that they are getting closer together. What happens to a pitch or frequency when the source is moving towards the person or away from him/her? It has been established from sound waves that the frequency is higher when a sound source is moving toward the person and lower when it is moving away from him/her. Another example of the Doppler effect is the way a police cars siren changes in pitch when it passes by. The sound waves in front of the car are condensed, while the trailing sound waves are longer and of a lower pitch. Light fr om an object moving towards the Earth is shifted toward the blue end of the spectrum, where as light from objects moving away is shifted toward the red end. The human ear cannot hear all possible frequencies. Very few people can hear any fewer than 16 Hz or any more than about 20 kHz (kilohertz--1 kHz equals 1,000 Hz). Music rarely makes use of this whole range of audible frequencies. The lowest note on a piano has a frequency of 27 Hz and the highest note a little more than 4 kHz.Show MoreRelatedDoppler Effect2322 Words   |  10 PagesDoppler effect The Doppler effect, named after Christian Doppler, is the change in frequency and wavelength of a wave as perceived by an observer moving relative to the source of the waves. For waves that propagate in a wave medium, such as sound waves, the velocity of the observer and of the source are relative to the medium in which the waves are transmitted. The total Doppler effect may therefore result from motion of the source, motion of the observer, or motion of the medium. Each of theseRead MoreRelativistic Doppler Effect and the Misunderstandings of Special Theory of Relativity815 Words   |  4 PagesThe present paper discusses the relativistic Doppler effect and tries to found misunderstandings in the present state of the Special theory of relativity. The authors conclusion that he found some â€Å"blue shift† which contradicts with time dilation is wrong. The weakest feature of the paper is that although the formulas, presented by authors, are in general correct, but they do not support the conclusions the author extract from them, and mistake is hidden in the interpretation. Lets focus on theRead MoreSpeed Detection of Moving Vehicles Using Doppler Effect2854 Words   |  12 Pages| SPEED DETECTION USING DOPPLER EFFECT AND RADAR | | | INTRODUCTION Although there is good road safety performance the number of people killed and injured on our roads remain unacceptably high. 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