The Big Bang, red-shift and the expanding Universe

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Question 19
Medium

Two competing models of the Universe's evolution are the Big Bang theory and the Steady State theory. Three major observational discoveries are:

I. The cosmological red-shift of distant galaxies.II. The Cosmic Microwave Background Radiation (CMBR).III. The primordial cosmic abundance ratio of helium-4 to hydrogen. \begin{aligned} &\text{I. The cosmological red-shift of distant galaxies.} \\ &\text{II. The Cosmic Microwave Background Radiation (CMBR).} \\ &\text{III. The primordial cosmic abundance ratio of helium-4 to hydrogen.} \end{aligned} ​I. The cosmological red-shift of distant galaxies.II. The Cosmic Microwave Background Radiation (CMBR).III. The primordial cosmic abundance ratio of helium-4 to hydrogen.​

Which of these discoveries can be explained by both theories, and which can only be explained by the Big Bang theory?

Both: I and III; Big Bang only: II

Both: I only; Big Bang only: II and III

Both: I and II; Big Bang only: III

Both: None; Big Bang only: I, II, and III

The Big Bang, red-shift and the expanding Universe Questions

  1. GCSE
  2. /Physics
  3. /The Big Bang, red-shift and the expanding Universe