An astrophysicist wants to determine the distance to a distant galaxy and its speed of recession away from Earth.
Which option correctly identifies the methods used to determine these two quantities?
Distance: Apparent brightness of a standard candle (e.g., a Type Ia supernova)
Speed of recession: Redshift of spectral lines from the galaxy
Distance: Apparent brightness of a standard candle (e.g., a Type Ia supernova)
Speed of recession: Total luminosity of the galaxy
Distance: Redshift of spectral lines from the galaxy
Speed of recession: Apparent brightness of a standard candle (e.g., a Type Ia supernova)
Distance: Total luminosity of the galaxy
Speed of recession: Apparent brightness of a standard candle (e.g., a Type Ia supernova)
104 exam-style questions on CIE IGCSE Physics 6.2 Stars and the Universe, covering 6.2.1 The Sun as a star, 6.2.2a Galaxies and astronomical distances, 6.2.2b The life cycle of a star, 6.2.3a Galaxies and the scale of the Universe, 6.2.3b Redshift, 6.2.3c The Big Bang Theory and cosmic microwave background radiation, and 6.2.3d The Hubble constant and the age of the Universe. Each one has a worked solution and a mark scheme showing where the marks go.