Question
Suppose that a galaxy's $21-\mathrm{cm}$ line of atomic hydrogen is shifted to $22 \mathrm{cm}$a. What is the redshift of the galaxy?b. What is its recession velocity?
Step 1
The redshift (z) of the galaxy can be calculated using the formula: z = (observed wavelength - rest wavelength) / rest wavelength In this case, the observed wavelength is 22 cm, and the rest wavelength is 21 cm. Plugging these values into the formula, we get: z Show more…
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