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daveed
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do you get a doppler shift when your moving towards a light source? like, i know light gets redshifted with expanding space and gravity, but if light always approaches you at the same speed, how would frequency change there?
Absolutely. The relativistic Doppler effect is this:daveed said:do you get a doppler shift when your moving towards a light source?
Doc Al said:Absolutely. The relativistic Doppler effect is this:
[tex]\nu = \nu_0 \sqrt{(1 + v/c)/(1 - v/c)}[/tex]
Where v is the relative speed of source and observer. If the source is approaching the observer, v is positive.
Doppler shift with light is the change in the wavelength of light due to the relative motion between the source of light and the observer.
Doppler shift with light occurs when the source of light and the observer are moving towards or away from each other. If the source and observer are moving closer together, the wavelength of light appears shorter (blue-shift). If they are moving away from each other, the wavelength appears longer (red-shift).
Doppler shift with light is an important tool in astronomy for determining the motion of celestial bodies. By measuring the shift in the wavelengths of light emitted by stars and galaxies, scientists can determine their speed and direction of motion.
The main difference between Doppler shift with light and sound is the speed at which they travel. Light travels much faster than sound, so the Doppler shift with light is more significant for objects that are moving at high speeds, such as stars and galaxies. Additionally, the Doppler shift with light is always observed as a shift towards the blue or red end of the spectrum, whereas the Doppler shift with sound can be observed as a shift in either direction.
Doppler shift with light is also used in other fields of science, such as meteorology and oceanography, to measure the speed and direction of moving objects. It is also used in medical imaging techniques, such as Doppler ultrasound, to measure blood flow and detect abnormalities in the body.