Quasars are among the most distant objects in the universe and are moving away from us at very high speeds, as discussed in Chapter 16. Astrophysicists use the redshift parameter z to determine the redshift of such rapidly moving objects. The parameter z is determined by observing a wavelength λ’ of a known spectral line of wavelength λsource on Earth; z = Δ λ’/ λsource= (λ’ - λsource)/ λsource Find the speed of two quasars having z values of 1.9 and 4.9.
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