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# Doppler Shift Calculator Online

The Doppler Shift Calculator is a valuable tool used to determine the observed frequency of a wave when either the source of the wave or the observer is in motion relative to the medium through which the wave travels. This calculation is based on the Doppler effect, where the frequency of a wave changes due to relative motion between the source emitting the wave and the observer receiving it.

### Formula of Doppler Shift Calculator

The formula utilized by the Doppler Shift Calculator is:

f_obs = f_source * (c + v_observer) / (c + v_source)

Where:

• f_obs: Observed frequency
• f_source: Source frequency (frequency emitted by the source)
• c: Speed of light in the medium (approximately 3 x 10^8 meters per second in a vacuum)
• v_observer: Velocity of the observer relative to the medium (positive if moving towards the source, negative if moving away)
• v_source: Velocity of the source relative to the medium (positive if moving away from the observer, negative if moving towards)

This formula allows for the calculation of the observed frequency based on these variables.

### General Terms and Reference Table

To assist users, here’s a table of commonly used terms:

This reference table provides useful insights into terms essential for understanding Doppler Shift calculations.