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# speed from delta lambda and lambda

Variable | Instructions | Datatype |
---|---|---|

`(Deltalambda)"shift in wavelength"` | specify shift in wavelength | Decimal (nm) |

`(lambda)"unshifted wavelength"` | specify original unshifted wavelength | Decimal (nm) |

sspickle.speed from delta lambda and lambda

The **Speed from Light Wavelength Shift** calculator computes the relative speed of an object based on the shift in wavelength of the observed emitted light verses the normal (not shifted) wavelength of light emitted.

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

- (
**Δλ**) The shift in wavelength of the light emitted. - (
**λ**) The wavelength of light (normal) emitted.

**Relative Speed**: The calculator returns the velocity of the object in meters per second. However, this can be automatically converted to other velocity units via the pull-down menu. To compute the wavelength shift (**Δλ**) from the velocity and nominal wavelength of light (**λ**), CLICK HERE.

##### General Information

For objects moving a speeds well below the speed of light there is a simple relationship between the speed of the object, the shift in the wavelength of the light emitted by the object, and the unshifted wavelength of the light (what the wavelength would be if the object were not moving). This equation computes that speed based on the other two numbers.

**speed from delta lambda and lambda**, references 1 equation/constant.

**Equations and Constants **

**speed from delta lambda and lambda**, is used in 3 calculators.

**Calculators**