What is FOR ? doppler shift?

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What is "FOR"? doppler shift?

What is "FOR"? I believe it an acronym having to do with the doppler shift? :confused:
 
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Some people may use it for Frame Of Reference.
 


"FOR" is not an acronym related to the doppler shift. It is a preposition that can have various meanings, such as indicating a purpose or direction, or being in favor of something. The doppler shift, on the other hand, refers to the change in frequency of a wave caused by the relative motion between the source of the wave and the observer. This phenomenon is commonly observed with sound waves, such as the change in pitch of an ambulance siren as it approaches and then passes by. It is also observed with light waves, such as the change in color of a star as it moves away from or towards Earth. The doppler shift is an important concept in many fields, including astronomy, meteorology, and medical imaging.
 
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