A star is moving away from the obsever on the Earth with a speed of 400 km/s. What will be the Doppler shift if the wavelength of light emitted by the star is `5800 Å` ?

Explanation

To solve the problem of calculating the Doppler shift for a star moving away from an observer on Earth, we can follow these steps:

### Step 1: Understand the Doppler Effect
The Doppler effect describes the change in frequency (or wavelength) of a wave in relation to an observer moving relative to the source of the wave. When the source is moving away from the observer, the observed wavelength increases (redshift).

### Step 2: Identify Given Values
- Speed of the star (v) = 400 km/s = 400,000 m/s (conversion to meters per second)
- Wavelength of light emitted by the star (λ) = 5800 Å = 5800 × 10^(-10) m (conversion to meters)
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