Doppler Effect Calculator
Compute observed frequency f′ = f·(v+vₒ)/(v−vₛ) for sound.
Input Data
Input Source freq f.
Hz
Input Sound speed v.
m/s
Input Observer speed vₒ (toward +).
m/s
Input Source speed vₛ (toward +).
m/s
Results
440Hz
f′ = f·(v+vₒ)/(v−vₛ).
At a glance:Doppler Effect Calculator: enter parameters to compute results; complements related calculators.
Formula
f′ = f·(v+vₒ)/(v−vₛ).
vₒ toward source, vₛ toward observer (approach positive).
How to Use
- Enter source frequency, sound speed and both speeds (approach positive).
- It returns observed frequency.
Case Studies
f=440, v=340, vₒ=34 → f′=484 Hz
f′ = 440·374/340 = 484 Hz (rising pitch when approaching).
FAQ
Why does an approaching train sound higher?
Wavefronts arrive denser, raising frequency—the Doppler effect.
Related Tools
References
Content review: Calculatorism Science Team. Formula and numeric tests verified; results for reference only.