Red-shift (physics Only) (GCSE Physics)

Which discovery about spectral line patterns in distant galaxies (same pattern but shifted) was crucial to concluding galaxies contain the same chemical elements as Earth?

Why is redshift considered stronger evidence for the Big Bang model than for a steady-state Universe?

How does observing redshift from many galaxies in all directions support the cosmological principle (that the Universe is homogeneous and isotropic on large scales)?

Explain why a photon emitted at ultraviolet wavelengths long ago may now be observed as visible or infrared light due to redshift.

A spectral line with rest wavelength ?0 appears at ?obs. The redshift z = 0.2. What is ?obs / ?0 ?

If two identical galaxies A and B have zA = 0.1 and zB = 0.4, and Hubble’s law holds with the same H0, what is the ratio of their distances dA : dB?

If a galaxy shows spectral lines shifted to longer wavelengths, and another galaxy shows the same lines shifted to shorter wavelengths, what do these observations indicate?

A star’s spectral lines are observed at longer wavelengths than in a laboratory. This shift is called red-shift because the light is shifted towards which part of the spectrum?

Which instrument is used by astronomers to measure precise wavelengths and detect redshift?

Which of the following would produce a blueshift rather than a redshift for a star’s spectral lines?

The dimensionless redshift z is defined as (observed wavelength - rest wavelength) divided by rest wavelength. Which algebraic expression matches that definition?