Cosmic Microwave Background Radiation
Explore the Wave from the Beginning of the Universe
Cosmic Microwave Background: CMB is one of the most important pieces of evidence supporting the Big Bang theory. Emitted over 13.8 billion years ago when the universe was hot, dense, and energetic, this leftover thermal radiation has stretched across expanding space into the microwave spectrum we detect today.
Interactive Red Shift Simulator
Use the interactive widget below to explore key facts, test how cosmological redshift stretches electromagnetic waves across cosmic history, and review core concepts required for Cambridge IGCSE Physics Paper 4.
Now let’s try to solve the past paper question!
Q40: Which statement about the cosmic microwave background radiation (CMBR) is correct?
A CMBR now has a frequency higher than that of infrared radiation.
B CMBR has always had exactly the same frequency.
C CMBR had a shorter wavelength in the past.
D CMBR was produced a long time after the Universe was formed.
Answer: C (CI IGCSE Physics 0625 Paper 21 May/June 2025)
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