Red or Blue Shift: Moving Light Sources Forward/Backward

Click For Summary
SUMMARY

The discussion centers on the application of red and blue shifts in relation to the Doppler effect as it pertains to light sources. It is established that redshift occurs when a light source moves away from an observer, while blueshift occurs when it moves towards the observer. The key point is that these shifts depend solely on the relative velocity between the observer and the light source. If the observer moves with the light source, no Doppler shift occurs, as there is no relative motion.

PREREQUISITES
  • Understanding of the Doppler effect
  • Familiarity with electromagnetic wave behavior
  • Knowledge of light spectrum analysis
  • Basic concepts of relative motion in physics
NEXT STEPS
  • Study the principles of the Doppler effect in detail
  • Explore the mathematical formulation of redshift and blueshift
  • Investigate the implications of redshift in cosmology, particularly with the Andromeda and Sombrero galaxies
  • Learn about spectral line analysis techniques used in astrophysics
USEFUL FOR

Astronomy enthusiasts, physicists, and students studying light behavior and the Doppler effect will benefit from this discussion.

lnsanity
Messages
34
Reaction score
0
I want to know if the red or blue shift apply if I am moving away or toward a light beam and if it still apply if I am moving the light beam source with me forward or backward.
 
Physics news on Phys.org
That is the entire reason for red/blue shifts of electromagnetic waves. When one is stationary with respect to the galaxy or source of light in question, and that light is moving radially toward us or away the waves will be stretched or contracted depending on it's motion. This doesn't mean that perceptually you will see "red" light or "blue" light, but when analyzing the spectrum you can determine where the lines ought to be and where they actually are, shifted towards the blue or red end of the spectrum. The same stands for the light in your hand although you wouldn't be able to tell the difference due to the slow velocity with which you're moving the light source.
 
lnsanity said:
I want to know if the red or blue shift apply if I am moving away or toward a light beam and if it still apply if I am moving the light beam source with me forward or backward.
The Doppler shifts depend only on the relative velocity between source and observer.
 
clem said:
The Doppler shifts depend only on the relative velocity between source and observer.

So that mean it apply when I am moving away or toward a light beam but does not apply when I am moving the light beam source with me forward or backward right ?
 
yes you´re right.
if the light source is moving towards you(or if you´re moving towards the light source if you will), the electromagnetic waves(visible light for instance) will be shifted towards blue.
if the light source is moving away from you, the electromagnetic waves will be shifted towards red.
 
lnsanity said:
So that mean it apply when I am moving away or toward a light beam but does not apply when I am moving the light beam source with me forward or backward right ?
If there is no relative velocity, there is no Doppler shift.
 
Andromeda Galaxy= moving towards us=blueshift
Sombrero Galaxy=moving away from us=redshift
 

Similar threads

  • · Replies 19 ·
Replies
19
Views
1K
  • · Replies 46 ·
2
Replies
46
Views
5K
  • · Replies 26 ·
Replies
26
Views
2K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 13 ·
Replies
13
Views
3K
  • · Replies 19 ·
Replies
19
Views
2K
  • · Replies 22 ·
Replies
22
Views
2K
  • · Replies 2 ·
Replies
2
Views
1K
  • · Replies 4 ·
Replies
4
Views
1K
  • · Replies 11 ·
Replies
11
Views
2K