Understanding the Doppler Equation: Effects of Moving Sources and Detectors

  • Thread starter Ishu
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In summary, the conversation discusses the impact of both the source and detector moving in the same direction at the same speed on the Doppler equation. It is asked if there will be a relative speed between them and if the sign matters in this scenario. It is concluded that there will be no Doppler effect when both are moving at the same speed.
  • #1
Ishu
27
1
hi what will happen to teh sign on doppler's general equation when both source and dectector are moving in the same direction at the same speed.? I didnt find this on my books.? Does anyone knows?

dopler equation

F' = f (V +/- Vd)
------------
(V +/- Vs)


?
 
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  • #2
Does anybody know about this?
 
  • #3
if both source and dectector are moving in the same direction at the same speed, is there a relative speed between them?

then, does it matter what the sign is?
 
  • #4
yeah both of them are at same direction at same speed 160 km
 
  • #5
There won't be any doppler effect when both the observer and source is moving at the same rate of speed.
 

1. What is the Doppler effect?

The Doppler effect is the perceived change in frequency of a wave or sound due to the relative motion between the source of the wave and the observer. It is commonly experienced when a siren from an approaching ambulance sounds higher in pitch as it gets closer and then lower in pitch as it moves away.

2. How does the Doppler effect work?

The Doppler effect works by compressing or stretching the wavelength of a wave as the source of the wave moves towards or away from the observer. This change in wavelength results in a perceived change in frequency, which is why the pitch of a sound appears to change.

3. What is a simple Doppler question?

A simple Doppler question is a problem that involves calculating the change in frequency or wavelength of a wave based on the relative motion between the source and the observer. These questions often involve using the Doppler equation: f = f₀(v ± vr)/(v ± vs), where f is the perceived frequency, f₀ is the original frequency, v is the speed of the wave, vr is the speed of the observer, and vs is the speed of the source.

4. What are some real-world applications of the Doppler effect?

The Doppler effect has many practical applications, including radar and sonar systems, weather forecasting, and medical imaging. It is also used in astronomy to measure the speed and direction of celestial objects.

5. How does the Doppler effect relate to the Big Bang theory?

The Doppler effect is a key piece of evidence for the Big Bang theory. The expansion of the universe causes light from distant galaxies to shift towards the red end of the spectrum, known as redshift. This is due to the Doppler effect and supports the idea that the universe is expanding from a single point of origin.

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