Red-shift (physics Only) (GCSE Physics)

Which observation provides direct evidence that the Universe is expanding?

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

Using the non-relativistic approximation v ˜ z c (where c = 3.00 × 10^8 m/s), what is the recessional velocity of a galaxy with z = 0.010?

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?

If redshift measurements show all galaxies are moving away from us, does that mean we are at the centre of the Universe?

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?

A spectral absorption line has rest wavelength 500.0 nm. In a galaxy it is observed at 505.0 nm. What is the redshift z?

Hubble’s law relates a galaxy’s recessional velocity v to its distance d by v = H0 d. Which statement about H0 (Hubble constant) is correct?

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

If the rest wavelength of a line is 600 nm and we observe it at 660 nm, what is z and the approximate recessional velocity?