Doppler effect for light Calculator

Calculates the Doppler shift in wavelength of light.

The forward angle of light source θ is set as 180 (recede), 0 (approach), 90 (laterally).

Doppler effect for light
    1. light source:
Wavelength of light λ0
    1. nm
Velocity v0
    1. km/s
Forward angle θ
    1. degree

    1. at observer:
Wavelength of light λ 
    2. nm
Frequency of light ν 
    2. GHz
Velocity ratio to light v0/c
Doppler effect for light
The faster the light source recedes, the redder its color becomes.

    Doppler effect for light
    [1-6] /6Disp-Num
    [1]  2019/05/06 17:26   Male / 30 years old level / An engineer / Very /
    Purpose of use
    Spacecraft doppler shift calculation
    [2]  2017/09/08 23:37   Male / 40 years old level / A teacher / A researcher / Very /
    Purpose of use
    Calculation of doppler effect of star light and cosmic microwave background relative to spaceship in space travel at velocities approaching the speed of light (>0.7 c).
    [3]  2015/07/27 06:58   Female / 50 years old level / High-school/ University/ Grad student / Very /
    Purpose of use
    Helping me to understand how to calculate distances in light years?
    Solve the Doppler equation to determine the relative velocity as a percentage of the speed of light (c) of an object being tracked by an active radar transmitting at 10 terahertz and receiving signals at 9.5 Terahertz. Is the object moving toward the radar or away from the radar? How fast is the relative velocity in kilometers per second?"
    [4]  2015/06/06 06:18   Male / 30 years old level / An office worker / A public employee / Very /
    Purpose of use
    Used to prove a point involving a hypothetical relativistic asteroid headed towards earth.
    [5]  2013/01/30 19:27   Male / 20 years old level / A teacher / A researcher / Very /
    Purpose of use
    it is very useful to clear our doubt
    [6]  2011/05/14 06:21   Male / Under 20 years old / A student / Very /
    Purpose of use
    want some worked examples on doppler effect.
    calculated example


    Thank you for your questionnaire.
    Sending completion


    To improve this 'Doppler effect for light Calculator', please fill in questionnaire.
    Male or Female ?



    Purpose of use?
    Comment/Request (Click here to report a bug).Bug report (Click here to report questionnaire.)
    Calculation bug(Please enter information such as specific input values, calculation result, correct result, and reference materials (URL and documents).)
    Text bug(Please enter information such as wrong and correct texts)
    Your feedback and comments may be posted as customer voice.