Doppler Redshift
Doppler redshift is caused by movement of a source away from the observer. The term applies to any increase in wavelength and decrease in frequency caused by relative motion, even outside the visible spectrum.
The redshift equals the velocity divided by the speed of light in a vacuum.
Formula
![QuantityVariable["z", "Unitless"] == Quantity[1, "SpeedOfLight"^(-1)]*QuantityVariable["v", "Speed"]](https://www.wolframcloud.com/objects/resourcesystem/marketplacestorage/resources/bbe/bbe76fb6-989c-4740-8fff-adcc43bb8fd9/Webpage/FormulaImage.png "Copy to Clipboard")
| symbol | description | physical quantity |
|---|---|---|
| z | redshift | "Unitless" |
| v | velocity | "Speed" |
Forms
Examples
Get the resource:
| In[1]:= | ![ResourceObject["Doppler Redshift"]](images/bbe/bbe76fb6-989c-4740-8fff-adcc43bb8fd9-io-1-i.en.gif){kind=small} |
| Out[1]= |  |
Get the formula:
| In[2]:= | ![FormulaData[ResourceObject["Doppler Redshift"]]](images/bbe/bbe76fb6-989c-4740-8fff-adcc43bb8fd9-io-2-i.en.gif){kind=small} |
| Out[2]= |  |
Use some values:
| In[3]:= | ![FormulaData[
ResourceObject[
"Doppler Redshift"], {QuantityVariable["v","Speed"] ->
Quantity[3000000, ("Meters")/("Seconds")]}]](images/bbe/bbe76fb6-989c-4740-8fff-adcc43bb8fd9-io-3-i.en.gif){kind=small} |
| Out[3]= |  |