Doppler Shift (Light)

\frac{Δ λ}{λ} = \frac{v}{c}

Approximate Doppler shift for electromagnetic waves when v << c.

Variables

Δλ

Wavelength shift

Change in wavelength

Rest wavelength

Original wavelength

Relative velocity

Source-observer velocity

m/s

Speed of light

≈ 3×10⁸ m/s

m/s

Non-relativistic approximation of relativistic Doppler formula. Positive v = receding (redshift).

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