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Τι (ποιος) είναι Doppler effect - ορισμός

Doppler effect

$Geometry for Doppler effects. Variables: <math>\vec{v}_\text{mob}</math> is the velocity of the mobile station, <math>\vec{v}_\text{Sat}</math> is the velocity of the satellite, <math>\vec{v}_\text{rel,sat}</math> is the relative velocity of the satellite, <math>\phi</math> is the elevation angle of the satellite and <math>\theta</math> is the driving direction with respect to the satellite.$
$Doppler Spread]]) and <math>f_{\rm D,Sat}</math> is the additional Doppler shift due to the satellite moving.$

FREQUENCY CHANGE OF A WAVE FOR OBSERVER RELATIVE TO ITS SOURCE

Doppler shift; Doppler Shift; Doppler Effect; Doppler's effect; The Doppler effect; Inverse Doppler effect; Acoustic Doppler effect; Doppler equations; Aberration redshift; Doppler-Fizeau effect; Dopplar Effect; Doppeler effect; Dopler shift; Dopler effect; Doppler-shifted; Change in notes of cats effect; Dopler; Dopplar; Doplar; The Doppler Effect; Doppler–Fizeau effect; Doppler navigation; Doppler spectra; Doppler frequency; Doppler

The Doppler effect or Doppler shift (or simply Doppler, when in context) is the change in frequency of a wave in relation to an observer who is moving relative to the wave source. It is named after the Austrian physicist Christian Doppler, who described the phenomenon in 1842.

https://en.wikipedia.org/wiki/Doppler_effect

Doppler effect

$Geometry for Doppler effects. Variables: <math>\vec{v}_\text{mob}</math> is the velocity of the mobile station, <math>\vec{v}_\text{Sat}</math> is the velocity of the satellite, <math>\vec{v}_\text{rel,sat}</math> is the relative velocity of the satellite, <math>\phi</math> is the elevation angle of the satellite and <math>\theta</math> is the driving direction with respect to the satellite.$
$Doppler Spread]]) and <math>f_{\rm D,Sat}</math> is the additional Doppler shift due to the satellite moving.$

FREQUENCY CHANGE OF A WAVE FOR OBSERVER RELATIVE TO ITS SOURCE

Doppler shift; Doppler Shift; Doppler Effect; Doppler's effect; The Doppler effect; Inverse Doppler effect; Acoustic Doppler effect; Doppler equations; Aberration redshift; Doppler-Fizeau effect; Dopplar Effect; Doppeler effect; Dopler shift; Dopler effect; Doppler-shifted; Change in notes of cats effect; Dopler; Dopplar; Doplar; The Doppler Effect; Doppler–Fizeau effect; Doppler navigation; Doppler spectra; Doppler frequency; Doppler

(also Doppler shift)

¦ noun Physics an increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move towards (or away from) each other.

Origin

C19: named after the Austrian physicist Johann Christian Doppler.

Photoacoustic Doppler effect

The photoacoustic Doppler effect is a type of Doppler effect that occurs when an intensity modulated light wave induces a photoacoustic wave on moving particles with a specific frequency. The observed frequency shift is a good indicator of the velocity of the illuminated moving particles.

https://en.wikipedia.org/wiki/Photoacoustic_Doppler_effect

Παραδείγματα από το σώμα κειμένου για Doppler effect

1. The experiments are complicated by the fact that the wavelengths of all the lines in the barcode are "red–shifted" by the expansion of the universe. (This is analogous to the Doppler effect that causes the pitch of a fire–engine siren to rise as it approaches you, and then fall as it races off into the distance.) However, this red shift also tells researchers how old the barcode is.