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Physics · Oct / Nov 2023 · Paper 12 · Question 40

5054The Universe

When observed on the Earth, the redshift of the light from galaxy X is smaller than the redshift of the light from galaxy Y. Which galaxy is closer to the Earth and which galaxy is receding from the Earth faster?

  1. Acloser to the Earth: X; faster recession: X
  2. Bcloser to the Earth: X; faster recession: Y
  3. Ccloser to the Earth: Y; faster recession: X
  4. Dcloser to the Earth: Y; faster recession: Y

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Correct answer: B. closer to the Earth: X; faster recession: Y

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