Edexcel International A Level Physics

Topic Questions

International A LevelPhysicsEdexcelTopic Questions5. Thermodynamics, Radiation, Oscillations & CosmologyCosmology

Cosmology

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1
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Current theory suggests that the universe is expanding.

Which of the following is evidence to support this theory?

  • All galaxies appear to be rotating in space.

  • Dark matter has been detected in the universe.

  • All distant stars are observed to be increasing in size.

  • The further a galaxy is from the Earth, the faster it recedes.

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2
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The spectrum of electromagnetic radiation from a galaxy is observed to have a redshift.

Which of the following is a correct statement about lines in this spectrum?

  • All the lines are in the red part of the spectrum.

  • All the lines are observed to have longer wavelengths than expected.

  • Lines with wavelengths at the red end of the spectrum are the most intense.

  • Light for all the lines was emitted with longer wavelengths than expected.

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3
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The initial value determined by astronomers for the Hubble constant was smaller than the currently accepted value.

Which of the following statements is correct?

  • The universe is bigger than astronomers initially thought.

  • The universe is not as old as astronomers initially thought.

  • The universe is older than astronomers initially thought.

  • The universe is smaller than astronomers initially thought.

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