A star emits light of wavelength 6000 Å and moves away from Earth with speed 5 km s⁻¹. Find the Doppler shift in wavelength. Take c = 3 × 10⁸ m s⁻¹.
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Question

A star emits light of wavelength 6000 Å and moves away from Earth with speed 5 km s⁻¹. Find the Doppler shift in wavelength. Take c = 3 × 10⁸ m s⁻¹.

G1 Physics · Accepted Answer

Step 1: For v ≪ c, Δλ/λ = v/c. Step 2: Δλ = 6000 Å × (5×10³)/(3×10⁸) = 0.1 Å. Final: A.