What happens when a particle of matter meets its corresponding antiparticle of antimatter?
What happens when a particle of matter meets its corresponding antiparticle of antimatter? The combined mass of the two particles is completely transformed into energy (photons). They can form a complete atom. The combined mass of the two particles is completely transformed into energy (photons).
What event made it possible for photons to begin to travel freely through the universe when the universe was about 380000 years old quizlet?
-The COSMIC MICROWAVE BACKGROUND is our name for the photons we see that were first released when the universe was about 380,000 years old. – The BIG BANG is the name we give to the moment when the expansion of the universe began.
What kinds of particles were present in the universe during the era of nucleosynthesis?
12 Cards in this Set
|What is the current temperature of the universe||A few degrees K|
|What kinds of particles were present in the universe during the era of nucleosynthesis||mostly matter|
|What kinds of atomic nuclei were present in the universe during the era of nuclei||mostly hydrogen and helium nuclei|
What happened to the quarks that existed freely during the particle era?
What happened to the quarks that existed freely during the particle era? They combined in groups to make protons, neutrons, and their antiparticles.
What happens when a particle meets its antiparticle quizlet?
When a particle meets its anti-particle the result is annihilation. All the mass of the particle and the anti-particle gets converted back to energy in the form of two gamma ray photons. Antiparticles can usually only exist for a fraction of a second before annihilation happens so you don’t get them in ordinary matter.
Which force is strongest within an atomic nucleus?
1) The strong nuclear force is the force that holds the protons and neutrons in the nucleus together. Based on the fact that atomic nuclei can be stable, briefly explain how you can conclude that the strong force must be even stronger than the electromagnetic force, at least over very short distances.
What is the evidence that there is dark matter beyond the disk of a spiral galaxy?
What is the evidence that there is dark matter beyond the disk of a spiral galaxy? The stellar mass distribution does not account for the rotation curve of galaxies. The outer portion of the rotation curve of a galaxy is flat.
What forms of normal matter existed when the universe was three minutes old?
What forms of normal matter existed when the universe was three minutes old? Hydrogen nuclei, helium nuclei, a trace of lithium nuclei, and independent electrons were present. What cosmological inference can you draw from the darkness of the night sky?
How many forces operated in the universe during the gut era?
The GUT Era is when three of the four fundamental forces are combined, but gravity has become distinct.
What era of the universe are we in?
The observable universe is currently 1.38×1010 (13.8 billion) years old. This time is in the Stelliferous Era. About 155 million years after the Big Bang, the first star formed. Since then, stars have formed by the collapse of small, dense core regions in large, cold molecular clouds of hydrogen gas.
What era are galaxies?
The Era of Atoms (380,000 years – 1 billion years or so) began as the universe finally cooled and expanded enough for the nuclei to capture free electrons, forming fully-fledged, neutral atoms. The first galaxies formed when the universe was roughly 1 billion years old and heralded the current Era of Galaxies.
What marked the end of the particle era?
The Electroweak Era ended when the Universe cooled sufficiently that W and Z bosons were no longer being created; they decayed away and without them the electroweak force separated from the electromagnetic one and became the short-range weak nuclear force.
What is the ultimate fate of an open universe?
Open Universe: In an open universe a negatively curved universe without dark energy would expand forever. The universe would end in a heat death (known as Big Chill as well), or Big Rip. Basically a heat death is where entropy (or disorder) increases in an isolated system (system = universe ).
Why Planck era is important?
One of the biggest puzzles is what occurred during the Planck era. This was an extremely short time span; the instant after the Universe began. Most likely, Inflation shaped the way the Universe looks today: structured and smooth. The Universe also reached a point of critical density.