**Transcription of Educational Content:**### Calculating the Doppler RedshiftThe Lyman α line in a galaxy's spectrum was observed to be 208 nm. Calculate the Doppler redshift.---**Explanation:**The Lyman α line is a spectral line of hydrogen that typically appears at 121.6 nm in a laboratory setting. The observation of this line at 208 nm indicates a shift due to the Doppler effect, most likely caused by the movement of the galaxy relative to the observer.To calculate the Doppler redshift (\( z \)), use the formula:\[ z = \frac{\lambda_{\text{observed}} - \lambda_{\text{rest}}}{\lambda_{\text{rest}}} \]Where:- \( \lambda_{\text{observed}} = 208 \, \text{nm} \)- \( \lambda_{\text{rest}} = 121.6 \, \text{nm} \)By plugging in the values, you can find the redshift, \( z \).

When there is relative motion between observer and source the wavelength observed will e shift. When…

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