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CAIE IGCSE Physics 6.2.3.6 The CMBR was produced shortly after

Practise explaining when CMBR formed and why expansion shifted this radiation into the microwave region.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • state that CMBR was produced shortly after the Universe was formed
  • explain microwave CMBR as early radiation redshifted as the Universe expanded
  • describe CMBR as radiation detected from all points in space around Earth

6.2.3.6—The CMBR was produced shortly after question 1

[Maximum number: 3]

Question (a)

(a)

Cosmic microwave background radiation (CMBR) can be observed in every direction in space around us.

[ 3 ]

Question (i)

(i)

State when CMBR was produced.

[ 1 ]

Question (ii)

(ii)

State and explain how the wavelength of this radiation has changed since it was formed.

[ 2 ]
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