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Doppler effect
Layer 1 — Physics
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Observed frequency of a wave depends on the relative velocity of source and observer.
Related concepts
Wave equation
Radial-velocity K ∝ m_p sin i / M_s^{2/3}: stellar Doppler wobble
Doppler Δλ/λ = v/c: v = 100 m/s ⇒ shift 50/149896229; 51 Peg b 28/149896229
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