Question: An electron jumps from n = 3 to n = 2 in a hydrogen atom in a distant galaxy, emitting light. If we detect that

An electron jumps from n = 3 to n = 2 in a hydrogen atom in a distant galaxy, emitting light. If we detect that light at a wavelength of 3.00 mm, by how much has the wavelength, and thus the universe, expanded since the light was emitted?

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