blue shift
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blue shift Motion-induced changed in the observed wavelength from a source that is moving toward us.
Blue shift- a shift in the wave-length of radiation emitted by an object when it is approaching us; the Doppler shift makes the wave fronts bunch closer together, causing the light to appear of a shorter wavelength, and hence bluer ...
Blue shift: Apparent shortening of the wavelength due to Doppler effect, of radiation received from a source in motion toward the observer.
blue shift
A displacement of emission or absorption line patterns toward the blue end of the spectrum as a result of the Doppler effect. As a star travels toward an observer, the wavelength of the star light decreases.
Blue Shift
(a) The shift to the blue of an object's spectrum. A blueshift arises when an object moves toward us: its light waves get compressed and reduced in wavelength, so that the entire spectrum is shifted to shorter, or bluer, wavelengths.
BLUE SHIFT
The blue shift is a decrease in the wavelength of the light that is emitted from an object that is moving toward us. This decrease in wavelength makes the object appear to be bluer than it actually is.
Red and blue shifts
Light from moving objects will appear to have different wavelengths depending on the relative motion of the source and the observer.
Blue shifts: Shorting of wavelengths of observed light when an object in moving toward the observer. Red Shifts: Lengthening of wavelengths of light as the object moves away from the observer.
Bok Globules ...
2. Can the red/blue shift technique be used for objects other than stars? Can you tell which way an emergency vehicle is traveling by the pitch of its siren?
3. What has the Doppler shift told astronomers about the expansion of the universe?
When the star is moving towards us, its spectrum gets blue shifted so that its spectral lines appear to shift towards the blue, shorter wavelength part of the spectrum.
The spectrum of the star coming towards us is blue shifted (seen at shorter than normal wavelengths), while the spectrum of the star moving away from us is red shifted (longer wavelengths).
The radial velocity of a star away from or towards the observer can be determined by measuring the red shift or blue shift of its spectrum.
Each photon emitted will be red or blue shifted by the Doppler effect depending on the velocity of the atom relative to the observer. The higher the temperature of the gas, the wider the distribution of velocities in the gas.
Gorgonzola did a great writeup on Blue Shift which is the exact opposite, when the object is approaching.
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47. Blue and Red Shifts
Blue shifts: Shorting of wavelengths of observed light when an object in moving toward the observer. Red Shifts: Lengthening of wavelengths of light as the object moves away from the observer.
In earlier stars NV predominates, with a subsequent blue shift of the average wavelength of the feature, whereas in later stars one finds mostly N III.
Differential Rotation (142 kb GIF image) - the rotation signal that includes a rapidly rotating equator and slowly rotating polar regions; Meridional Flow (82 kb GIF image) - a flow directed from the equator towards the poles; Convective Blue Shift ...
Electromagnetic Spectrum Unit -- This unit calls for students to build simple spectroscopes to study visible light. Lesson plans in this unit include Simple Spectroscope; Project Visible Spectra; Cereal Box Spectroscope; Red Shift, Blue Shift; ...
If quasars were simply objects being ejected from nearby galaxies at high speeds, and not the distant objects they appear to be, then some would have blue shifts.
 See also: Light, Time, Star, Astronomy, Universe
  
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