Which statement about the Cosmic Microwave Background Radiation (CMBR) is correct?
The temperature of the CMBR has increased as the Universe expanded.
The CMBR has a longer wavelength now than when it was first emitted.
The CMBR was first detected as visible light.
The CMBR is only detected from specific point sources in the night sky.
59 exam-style questions on CIE IGCSE Physics 6.2.3a Galaxies and the scale of the Universe. Each one has a worked solution and a mark scheme showing where the marks go.