A student argues that the cosmic microwave background shows that the Universe is expanding today, while red-shift is the radiation left over from its beginning.
Which correction is required?
Red-shift indicates recession; the CMB is remnant radiation.
Red-shift indicates contraction; the CMB is remnant radiation.
Red-shift indicates recession; the CMB is reflected starlight.
Red-shift indicates contraction; the CMB is reflected starlight.
94 exam-style questions on Edexcel GCSE Physics 7.2 The Universe and red-shift, covering 7.2.1 Big Bang and Steady State theories, 7.2.2 Evidence for the Big Bang, 7.2.3 The Doppler effect and red-shift, 7.2.4 Red-shift as evidence for an expanding Universe, and 7.2.5 The CMB and the accepted model. Each one has a worked solution and a mark scheme showing where the marks go.