OCR A level Physics: Astronomical Distances

OCR A level Physics: Cosmology (Big Bang)

OCR A level Physics: Chapter 20 Cosmology (Big Bang) is apart of the Module 5: Newtonian world and Astrophysics. All presentations come with worked examples, solutions and homeworks. 20.1 Astronomical Distances 20.2 The Doppler Effect 20.3 Hubble’s Law 20.4 The Big-bang Theory 20.5 Evolution of the Universe * Astronomical distances: light-years, parsec, astronomical unit * Astronomical angles - degree, arcminute, arcsecond * Parallax Angle * The definition of the Doppler effect * Changes in pitch of sound waves due to relative motion * Absorption spectra and electron energy levels * Red-shift and blue-shift absorption spectra * The Doppler equation * The condition for velocity for the Doppler equation * The Cosmological Principle * Hubble’s Observations * Hubble’s Law * Hubble’s constant and the gradient of a graph * Converting between km s-1 Mpc-1 into s-1 * The expanding Universe model. * Georges Lemaître’s Theory * Evidence for the Big Bang Model * Hubble’s Law (expanding Universe) * Microwave Background Radiation * Source of the Microwave Background Radiation * Hubble’s constant and the age of the Universe * The evolution of the Universe from the Big-bang to 13.7 billion years later * The composition of the Universe * Experimental evidence for dark matter * Experimental evidence for dark energy