The recombination era of the big bang was very important in several ways. Explain what happened during this time and what observable effects of the era existed
What will be an ideal response?
Originally, the Universe was so hot that the gas was completely ionized, and electrons were not attached to nuclei. Photons could not travel far without being deflected by an electron.
At an age of around 400,000 years, free electrons were spread so far apart that photons could travel for thousands of parsecs before being deflected. At this point, the Universe began to become transparent to photons.
At about this time, the temperature of the gas dropped to the point where electrons could join with protons to form neutral hydrogen in a process called recombination. As the free electrons were converted, the gas became close to transparent and the photons could pass through undeflected.
These photons were emitted from a gas of 3000K and retained the blackbody temperature of the gas. This radiation, redshifted to an apparent temperature of 2.7K, is the cosmic microwave background radiation we observe today.
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A) nearly as fast as the waves it produces. B) as fast as the waves it produces. C) faster than the waves it produces. D) none of the above
Concerning dark energy, we do know
A) combined with dark matter, it will ultimately produce a closed universe. B) its density remains constant over time, so it is not important in the early universe. C) that it is created when matter annihilates anti-matter. D) that it was revealed with Type II supernovae distances in the late 1990s. E) that it makes up 90% of all the matter and energy in the whole universe.
Capacitors in series share the same charge and capacitors in parallel share the same voltage
Indicate whether the statement is true or false
In what region of the Sun is solar energy generated?
A) the outer surface B) the inner surface C) the mid-interior D) the inner core