What does the evidence supporting the Big Bang theory assume about the universe when it began? Select the two correct answers.(1 point)
Responses
It was contracting
It was contracting
It was extremely hot.
It was extremely hot.
It was very tiny.
It was very tiny.
It was composed of ice.
It was extremely hot.
It was very tiny.
Which describes nuclear fusion?(1 point)
Responses
starts when a neutron slams into an atom, causing two atoms to form one, heavier atom
starts when a neutron slams into an atom, causing two atoms to form one, heavier atom
starts when two atoms slam together to form one, heavier atom
starts when two atoms slam together to form one, heavier atom
starts when two atoms slam together, causing the larger atom to split into two smaller atoms
starts when two atoms slam together, causing the larger atom to split into two smaller atoms
starts when a neutron slams into an atom, causing the larger atom to split into two smaller atoms
starts when a neutron slams into an atom, causing the larger atom to split into two smaller atoms
starts when two atoms slam together to form one, heavier atom
Which describes nuclear fission?(1 point)
Responses
starts when two atoms slam together to form one, heavier atom
starts when two atoms slam together to form one, heavier atom
starts when a neutron slams into an atom, causing two atoms to form one, heavier atom
starts when a neutron slams into an atom, causing two atoms to form one, heavier atom
starts when two atoms slam together, causing the larger atom to split into two smaller atoms
starts when two atoms slam together, causing the larger atom to split into two smaller atoms
starts when a neutron slams into an atom, causing the larger atom to split into two smaller atoms
starts when the larger atom splits into two smaller atoms after being struck by a neutron
The correct answers are:
1. It was extremely hot.
2. It was very tiny.
The correct answers are:
1. It was extremely hot.
2. It was very tiny.
To understand why these assumptions are made, let's delve into the evidence supporting the Big Bang theory. The Big Bang theory proposes that the universe originated from a singular, extremely hot and dense point roughly 13.8 billion years ago. The main evidence supporting this theory includes the expanding universe, the cosmic microwave background radiation, and the abundance of light elements.
1. The observation of an expanding universe strongly supports the idea that the universe started from a highly compressed state and has been expanding ever since. By extrapolating backward in time, scientists deduce that the universe was once incredibly tiny and dense.
2. The presence of cosmic microwave background radiation is another significant piece of evidence. This radiation permeates the entire universe and is considered residual thermal radiation from the early stages of the universe. Its uniformity and characteristic black body spectrum suggest a hot, dense state during the initial stages of the universe.
In summary, the evidence supporting the Big Bang theory assumes that the universe began in an extremely hot and dense state, often referred to as a singularity, and that it was very tiny in size.