# Doppler Effect

Written by Jerry Ratzlaff on . Posted in Classical Mechanics

Doppler effect, abbreviated as $$f_o$$, is the increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move toward (or away) each other.

## Doppler effect formula

 $$\large{ f_o = \frac{ v \;+\; v_o }{ v \;+\; v_s } \; f_s }$$

### Where:

 Units English Metric $$\large{ f_o }$$ = observer frequency $$\large{ Hz }$$ $$\large{ Hz }$$ $$\large{ v }$$ = speed of sound waves $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$ $$\large{ v_o }$$ = velocity of observer $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$ $$\large{ v_s }$$ = velocity of source $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$ $$\large{ f_s }$$ = actual frequency of sound waves $$\large{ Hz }$$ $$\large{ Hz }$$

Tags: Speed Equations