Edexcel International GCSE Physics8d Cosmology Checklist

Paper 2 only

• I can describe the past evolution of the universe, and the main arguments for the Big Bang theory.
• I can describe the evidence that supports the Big Bang theory (red-shift and cosmic microwave background (CMB) radiation).
• I can describe that, if a wave source is moving relative to an observer, the observed frequency and wavelength change.
• I can use the equation relating change in wavelength, reference wavelength, the velocity of a galaxy and the speed of light: change in wavelength / reference wavelength = velocity of a galaxy / speed of light, (λ − λ₀) / λ₀ = Δλ / λ₀ = v / c
• I can describe the red-shift in light received from galaxies at different distances from the Earth.
• I can explain why the red-shift of galaxies is evidence that the universe is expanding.