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`\Delta \lambda = lambda (V/c)`

0.4861

The **Wavelength Shift** calculator computes the shift in the wavelength of light (**Δλ**) based on the relative velocity (**V**) and the nominal wavelength of the light source (**λ**)

**INSTRUCTIONS**: Choose units and enter the following:

- (
**V**) This is the relative velocity of the light emitting source. - (
**λ**) This is the wavelength of light from the emitting source w/o any velocity shift.

**Wavelength Shift(Δλ)**: The calculator computes the shift in wavelength (**Δλ**) in nanometers. However, this can be automatically converted to compatible units via the pull-down menu.

The formula for Wavelength Shift is:

**Δλ = λ•(V/C)**

where:

- Δλ = Wavelength Shift
- λ = wavelength
- V = velocity
- C = Speed of Light

A source of light moving toward or away from an observer will have it's spectrum shifted toward the blue (moving toward) or to the red (moving away). This formula gives the magnitude of the wavelength shift given the speed of the source relative to the observer (for speeds well below the speed of light only!).

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