28 Jul 07
Originally posted by chessisvanityI like to talk about the Doppler effect you know? All the chess players like to hear this on the Only Chess forum:
i wish.....then atleast i'd get laid.
Ok. Where do I start to describe the Doppler effect? It’s like when you are going to work and suddenly you hear the sirens of an ambulance coming from far away. You then hear a change in the sound when they pass by you; it’s a change in pitch when the ambulance drive past you with its sirens on. Did you notice that when the ambulance is coming towards you, you hear a high pitched siren and when the ambulance drives away from you hear a low pitched siren. So, the change in pitch in this situation, is called the Doppler effect.
The Doppler effect is the change in pitch that you hear when the police drive past with their sirens on. When they're coming toward you, you hear a high pitched siren; and when they drive away from you, you hear a low pitched siren.
Christian Doppler, who first discovered this, wrote about this effect in his famous monograph Über das farbige Licht der Doppelsterne und einige andere Gestirne des Himmels - Versuch einer das Bradleysche Theorem als integrirenden Theil in sich schliessenden allgemeineren Theorie
We can explain the relationship between observed frequency and emitted frequency by this formula: The observed frequency is equal to emitted frequency times the speed of waves in the medium divided by the speed of waves in the medium plus or minus the velocity of the source.
It the waves are traveling by the speed of light then change is frequency is the transmitted frequency multiplied by the velocity of the transmitter and divided by the speed of light and that my friend is also equal to the velocity of the transmitter divided by the wavelength of the transmitted wave subject to change.
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