# Doppler Effect Calculator

Doppler Effect Calculator is a online tool that displays the frequency or wavelength if an observer is in motion relative to the wave source. The tool is flexible to use and gives you frequency in a fraction of seconds after providing the inputs.

### What is Doppler Effect?

Doppler Effect is defined as the change in frequency or wavelength of waves with respect to the observer who is in motion relative to the wave source. For Example you are on a sideway and an ambulance is arriving towards you and it passes you. The amount of sound you hear after the ambulance left decreases and this is beacuse the frequency decreases.

### Doppler Effect Formula or Doppler Shift Equation

Doppler Shift is given by the expression f = fΓéÇ(v + vr)/(v + vs)

- Where f is the observed frequency of wave and is expressed in units Hz
- fΓéÇ is the frequency of emitted wave and its units are also Hz
- v is the velocity of waves in the medium and default value is 343.2 m/s i.e. speed of sound propagating in air
- vr is the velocity of the receiver and its value is positive if the receiver moves towards the source
- vs is the source velocity and its value is positive if the source moves away from the observer.

**Example**

Calculate the Observer Frequency if the emitted frequency is 15 Hz, Receiver Velocity is 10 m/s, Source Velocity is 8 m/s, wave velocity is 343.2 m/s?

**Solution:**

Given that

Emitted Frequency fΓéÇ = 15 Hz

Wave Velocity v = 343.2 m/s

Receiver Velocity vr = 10 m/s

Source Velocity vs = 8 m/s

We know formula for Doppler Effect is f = fΓéÇ(v + vr)/(v + vs)

Substituting the input values in the above formula we can find the observer frequency f

f = 15(343.2+10)/(343.2+8)

Simplifying further we will get the observed frequency f = 15.08542 Hz

Therefore, the observed frequency f for given inputs is 15.08542 Hz

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### FAQs on Doppler Effect Calculator

**1. What is meant by Doppler Effect? **

Doppler Effect or Doppler Shift is known as change in frequency or wavelength of waves with respect to the observer in motion relative to wave source.

**2. What is Doppler Effect Formula?**

Formula for Doppler Effect is f=f0 [(v+vr)/(v+vs)]

**3. What is an everyday Doppler Effect Example?**

One of the most common examples of Doppler Effect is pitch of a siren or an ambulance.

**4. What is Doppler Effect Used for?**

Doppler Effect is used to measure Speed in RADAR Sensors.