If a galaxy emitted light that was perfectly green (550 nm) and it is measured today with a redshift ($z$) of 1.0, what is the observed wavelength?
Answer
1100 nm
A redshift ($z$) of 1.0 means the wavelength has doubled. Calculating this: $1.0 = ( ext{Observed} - 550) / 550$, which solves to an observed wavelength of 1100 nm.
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