Quick 'n' easy question about doppler effect

In summary, the conversation discusses the derivation of the Doppler effect formula for light and electromagnetic waves, which differs from the classical theorem of speed addition due to the constant speed of light. The formula is rewritten in a convenient form for deriving the low speed approximation.
  • #1
asfd
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Doppler effect revisited

Am I right when I say that the doppler effect formula "f=f0((v+vo)/(v+vs))" is derivated from the classical theorem of speed addition and this is why the doppler effect for light and EM waves is different?
 
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  • #2
Because light does not behave as a classical particle, it has a constant speed for all observers. It is frequency and wavelength which undergo a Doppler shift in light.
 
  • #3
I'm a little confused here...

I don't get how on this page: hyperphysics they get the first equation... I don't see the relativistic doppler effect written that way anywhere and I don't understand how they get ot that equation and how to expand it with maple...Anybody can help?
 
  • #4
That equation is just the relativistic Doppler formula rewritten in a form convenient for deriving the low speed approximation. They took something that usually appears in a form like:
[tex]\sqrt{\frac{1 + x}{1 - x}}[/tex]
And rewrote it like:
[tex]\frac{\sqrt{1 - x^2}}{1 - x}[/tex]
These expressions are equivalent.
 

FAQ: Quick 'n' easy question about doppler effect

1. What is the Doppler Effect?

The Doppler Effect is a phenomenon that occurs when there is a relative motion between a source of waves and an observer. This results in a change in the frequency of the waves perceived by the observer.

2. How does the Doppler Effect work?

The Doppler Effect is caused by the compression or stretching of waves as they move towards or away from an observer. As the source of the waves moves closer, the waves are compressed and the perceived frequency increases. Conversely, as the source moves away, the waves are stretched and the perceived frequency decreases.

3. How is the Doppler Effect used in everyday life?

The Doppler Effect is used in various fields such as astronomy, meteorology, and medicine. In astronomy, it is used to measure the movement of stars and galaxies. In meteorology, it is used to track weather patterns. In medicine, it is used in ultrasound technology to measure blood flow and diagnose heart conditions.

4. What is the difference between the Doppler Effect and the Doppler Shift?

The terms Doppler Effect and Doppler Shift are often used interchangeably, but there is a slight difference between the two. The Doppler Effect refers to the change in frequency of waves due to relative motion, while the Doppler Shift specifically refers to the change in frequency of light waves due to the relative motion of a light source and an observer.

5. Can the Doppler Effect be observed with all types of waves?

Yes, the Doppler Effect can be observed with all types of waves, including sound waves, light waves, and water waves. However, the effect is most noticeable with sound waves because they travel at a relatively slow speed, making the change in frequency more apparent.

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