To determine the value of the Hubble constant, an astronomer measures the distance of a galaxy from the Earth as 3.6 × 1022 km.
She also measures the speed of recession of the galaxy from the Earth as 8.1 × 103 km/s.
From these data, what is the value of the Hubble constant?
2.3×10−22 s−12.3 \times 10^{-22}\text{ s}^{-1}2.3×10−22 s−1
2.3×10−19 s−12.3 \times 10^{-19}\text{ s}^{-1}2.3×10−19 s−1
4.4×1018 s−14.4 \times 10^{18}\text{ s}^{-1}4.4×1018 s−1
2.9×1026 s−12.9 \times 10^{26}\text{ s}^{-1}2.9×1026 s−1
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.