The Cosmic Microwave Background Radiation is left over radiation from the Big Ba
ID: 1648851 • Letter: T
Question
The Cosmic Microwave Background Radiation is left over radiation from the Big Bang which completely encircles us and is coming from all directions in space. The radiation that we detect today started its journey at the time of recombination, when the universe was about 300,000 years old. Explain why this light is detected from this time.
a. Before the time of Recombination all the electrons were free particles. They were not bound to a nucleus. When an electron is free it acts like a particle, which means it is capable of absorbing any wavelength to light. During this time light of all wavelengths was being absorbed and re-emitted in random directions. This made the universe opaque. When expansion cooled the radiation in the universe to the point that the radiation could not ionize the electrons, electrons became bound to nuclei and started acting like standing waves. The matter in the universe could now only absorbs very specific wavelengths and the rest of the light was unaffected by the matter. The universe became transparent, which meant most light could now travel in a straight line.Explanation / Answer
B) answer is 'b'
Before the time of recombination all the electrons were free particles.They were not bound to a nucleus When an electron is free it acts like a particle , which means it is not able to absorb light. During this time no light from the Big Bang was being absorbed and this caused a light to be moving in random directions. This made the universe opaque. When expansion cooled the readiation in the universe to the point that the radiation could not ionize the electrons, electrons became bound to nuclei and started acting like standing waves. The matter in the universe could now only absorb very specific wavelengths. The removal of some of the light through absorption allowed the rest of the light to travel freely and the universe became transparent.
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