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Astrophysics

# Astrophysics - ASTROPHYSICS REVIEW PACKET 1 This question...

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Unformatted text preview: ASTROPHYSICS REVIEW PACKET 1. This question is about the possible evolution of the Universe. The diagram below is a sketch graph that shows three possible ways in which the size of the Universe might change with time. Size of Universe Time Depending on which way the size of the Universe changes with time, the Universe is referred to either being open or flat or closed . (a) On the diagram, identify each type of Universe. (3) (b) Complete the table below to show how the mean density ρ of each type of Universe is related to the critical density ρ . Type of Universe Relation between ρ and ρ Open Flat Closed (3) (Total 6 marks) 2. This question is about galactic redshift, the Hubble constant and the age of the Universe. 1 (a) State how the observed redshift of light from many distant galaxies is explained. ..................................................................................................................................... (1) (b) Using the axes below sketch a graph to show how the recessional speed v between galaxies varies with the distance d between them. (Please note this is a sketch graph; you do not need to add any numerical values.) v d (1) (c) State how the Hubble constant is determined from such a graph. ..................................................................................................................................... (1) (d) A value for the Hubble constant is 100 km s –1 Mpc –1 . Use this value to estimate the age of the Universe in years. (1 Mpc ≈ 3 × 10 19 km, 1 year ≈ 3 × 10 7 s) ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... (2) (Total 5 marks) 3. This question is about the Big Bang model. (a) Describe what is meant by cosmic background radiation . ASTROPHYSICS REVIEW PACKET ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... (2) (b) Explain how cosmic background radiation is evidence in support of the Big Bang model of the universe....
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Astrophysics - ASTROPHYSICS REVIEW PACKET 1 This question...

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