Doppler Effect

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	\(\large{ Hz }\)	\(\large{ Hz }\)