If the shift of wavelength of light emitted by a star is towards violet, then this shows that star is
Options

Question

If the shift of wavelength of light emitted by a star is towards violet, then this shows that star is

G1 Physics · Accepted Answer

Step 1: For light, use relativistic Doppler when speed is a sizable fraction of c; for v ≪ c, Δλ/λ ≈ v/c. Step 2: Red shift means recession and blue/violet shift means approach. Step 3: Substitute the given speed. Final: B: Moving towards earth.