A distant galaxy has a redshift, zzz, of 0.042.
The speed of light, c=3.00×108 m/sc = 3.00 \times 10^8 \text{ m/s}c=3.00×108 m/s.
The recession velocity, vvv, of the galaxy is given by the equation:
v=z×c v = z \times c v=z×cCalculate the recession velocity of this galaxy. Give your answer in standard form.
53 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.