Pearson Edexcel International GCSE (9–1) · PHYSICS · Section
COSMIC MICROWAVE BACKGROUND (CMB) RADIATION
15 practice questions
Practice questions
1–7 of 7 · Easy
Question 1
1 mark · Easy
Answer and see the solution →State the name given to the radiation that is considered the afterglow of the Big Bang and is detected in all directions of the universe.
Question 2
2 marks · Easy
Answer and see the solution →Light from a distant galaxy has a wavelength of 550 nm, while the same spectral line measured from our Sun is at 500 nm. Calculate the speed at which the galaxy is moving away from Earth. (speed of light m/s)
Question 3
2 marks · Easy
Answer and see the solution →Explain how the cosmic microwave background (CMB) radiation supports the Big Bang theory. Give two points in your answer.
Question 4
1 mark · Easy
Answer and check →Which observation about distant galaxies provides evidence that the universe is expanding?
- A.Their light is red-shifted.
- B.Their light is blue-shifted.
- C.Their light is unchanged.
- D.They emit only microwaves.
Question 5
1 mark · Easy
Answer and see the solution →A scientist observes that the absorption lines in the spectrum of a distant galaxy have moved towards longer wavelengths than those from our Sun. State the name of this effect.
Question 6
3 marks · Easy
Answer and see the solution →The universe is thought to have begun with a huge explosion called the Big Bang.
(a)[1 mark]State one observation from distant galaxies that supports the idea that the universe is expanding.
(b)[2 marks]Describe what the cosmic microwave background (CMB) radiation is.
Question 7
3 marks · Easy
Answer and see the solution →Light from a distant galaxy has a wavelength of 660 nm. The same spectral line measured from our Sun is 600 nm. Calculate the speed at which the galaxy is moving relative to Earth. (Speed of light = m/s)