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(d) Cosmology

Describe the past evolution of the universe and the main arguments in favour of the Big Bang theory

Describe evidence that supports the Big Bang theory (red-shift and cosmic microwave background - CMB - radiation)

Describe that if a wave source is moving relative to an observer, there will be a change in the observed frequency and wavelength

Use change in wavelength ÷ reference wavelength = galaxy velocity ÷ speed of light: Δλ/λ₀ = v/c, where Δλ = λ − λ₀.

Describe the red-shift in light received from galaxies at different distances away from the Earth

Explain why the red-shift of galaxies provides evidence for the expansion of the universe

Objective notes

6 learning objectives

813P Big Bang theoryDescribe the past evolution of the universe and the main arguments in favour of the Big Bang theoryView 814P Big Bang evidenceDescribe evidence that supports the Big Bang theory (red-shift and cosmic microwave background - CMB - radiation)View815P Moving wave sourcesDescribe that if a wave source is moving relative to an observer, there will be a change in the observed frequency and wavelengthView 816P Red-shift equationUse change in wavelength ÷ reference wavelength = galaxy velocity ÷ speed of light: Δλ/λ₀ = v/c, where Δλ = λ − λ₀.View 817P Galaxy red-shiftDescribe the red-shift in light received from galaxies at different distances away from the EarthView 818P Expansion of the universeExplain why the red-shift of galaxies provides evidence for the expansion of the universeView

ConceptIGCSE Physics