CAIE IGCSE Physics 6.2.3.4 Redshift in the light from distant

Practise linking redshift observations from distant galaxies to expansion of the Universe and Big Bang evidence.

Exam points

state that redshifted light from distant galaxies supports the Big Bang Theory
link galaxy redshift to the conclusion that the Universe is expanding

[Maximum number: 2]

Table 9.1 shows a wavelength of electromagnetic radiation from hydrogen observed in the laboratory and from three galaxies.

The galaxies are at different distances from the Earth.

Table 9.1

Describe what Table 9.1 shows about the motions of the galaxies and state what this suggests is happening to the Universe.

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6.2.3.4—Redshift in the light from distant question 1