Doppler Effect: Explaining Frequency Change & Applications

  • Context: Undergrad 
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Discussion Overview

The discussion revolves around the Doppler Effect, specifically focusing on the explanation of frequency changes in different scenarios and its various applications. Participants explore both theoretical aspects and practical implementations of the Doppler Effect.

Discussion Character

  • Exploratory
  • Technical explanation
  • Application-focused

Main Points Raised

  • One participant poses questions about the reasons for frequency changes in different situations related to the Doppler Effect.
  • Another participant provides a link to a resource, suggesting that further exploration is needed beyond the initial questions posed.
  • A detailed explanation is offered regarding how the movement of a source affects the frequency perceived by a receptor, involving a scenario with wavelengths and distances.
  • Applications of the Doppler Effect are listed, including its use in RADAR for speed measurement, astronomy for redshift analysis, and medical ultrasound for imaging internal organs.
  • A suggestion is made to explore interactive applets that visually demonstrate the Doppler Effect, indicating that such tools can enhance understanding of frequency shifts.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the explanations or applications of the Doppler Effect, and multiple viewpoints and resources are presented without resolution.

Contextual Notes

Some assumptions about the scenarios involving the Doppler Effect are not explicitly stated, and the discussion includes references to external resources that may contain additional information or perspectives.

Who May Find This Useful

Individuals interested in physics, particularly those studying wave phenomena, applications of the Doppler Effect in various fields, or seeking interactive learning tools.

cutesoqq
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I hv the following problems:

1. Using Doppler's effect, can we explain why frequency will change in two different situation?

2. What is the application of Doppler's effect? :smile:
 
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1. http://www.pinkmonkey.com/studyguides/subjects/physics/chap10/p1010201.asp

A meagre attempt to put it into words. Assume the distance between source and receptor is -say- ten wavelengths and it took T time to emit it. Now the source moves in T time (the time for the signal to travel) to -say- half the distance, the receptor has to receive not only the ten waves in between (emitted before the move) but also part of the waves that were emited during the move. Since there are now only five waves in between, the receptor must have noticed the ten waves that ware emitted in the T time plus the 5 waves that are no longer in the distance between the two.

2.
-To stop roling smilies.
-RADAR to see only objects with minimum or maximum relative speed
-RADAR to measure the realitive speed of targets. (Police, meteorolgy)
-airborne RADAR for ground mapping, enhancing the resolution (DBS)
-Astronomy: the "red shift" is doppler effect
-Medical ultrasound- or pregnacy detectors, imaging the internal organs on their movements.

and a lot more I guess
 
Last edited by a moderator:
thx>> Andre^^
 
Go to www.merlot.org and type Doppler in the search engine. Fu Kwun Hwang's and Angel Franco Garcia's java applets demonstrate the effect very convincingly. It will be obvious by examining the applets running why the frequency shifts.
 

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