A distant galaxy is observed with a spectrometer. This galaxy produces an emission line that is identified as a Hydrogen transition that normally has a wavelength of 21 cm. For this galaxy, however, the emission line is observed at a wavelength of 38 cm.
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![A distant galaxy is observed with a spectrometer. This galaxy produces an emission
line that is identified as a Hydrogen transition that normally has a wavelength of 21
cm. For this galaxy, however, the emission line is observed at a wavelength of 38 cm.
How fast is this galaxy moving away from us in units of km/s [round off your answer
to 1 km/s]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fca44bcf7-122e-4eb0-85c7-29721a90f04d%2F8e0a45b8-c5b9-44bd-b17a-653444b66d2d%2Fchd3yj9_processed.png&w=3840&q=75)
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