Answer: leftover radiation from the big bang
Microwave background radiation is a form of electromagnetic radiation that is present in the whole universe and completely fills it.
Its frequency belongs to the microwaves range and is one of the main demonstrations of the of the Big Bang theory model.
It is important to note the Big Bang occurred 400,000 years before the events related to the microwave cosmic radiation, this means the Big Bang occurred first.
The number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place in the periodic table.
Denoted by letter Z
Velocity = displacement / time
v = 400 / 2
v = 200 km/h
Now, = 200 / 3.6 = 55.55 m/s
In short, Your Answer would be 55.55 m/s
Hope this helps!
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