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Antimatter and Baryon Asymmetry in Physics

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Antimatter and Baryon Asymmetry in Physics

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Questions and Answers

What happens when a particle and its antiparticle come into contact with each other?

They repel each other due to opposite charges.

They both convert into other particles with equal energy. (correct)

They combine to form a larger particle.

They create a vacuum in space.

Why is antimatter not found naturally on Earth in significant quantities?

It only exists in outer space.

It instantly meets ordinary matter and gets annihilated. (correct)

It is too heavy to exist on Earth.

It is repelled by the Earth's magnetic field.

According to Albert Einstein's equation E=mc^2, what happens during an annihilation of a particle and its antiparticle?

The particles combine to form antimatter.

Both are converted into other particles with equal energy. (correct)

The antiparticle absorbs the particle's energy.

The particles repel each other due to opposite charges.

Why do we observe far more matter than antimatter in the observable universe?

Baryon asymmetry leads to an imbalance favoring matter. (C) Signup and view all the answers

Why is antimatter considered the opposite of matter?

Because it consists of antiparticles of those in ordinary matter. (A) Signup and view all the answers

What type of energy do the resulting particles have after the annihilation process?

The difference in kinetic energy from the rest mass of products. (B) Signup and view all the answers

What process requires an asymmetry in physical laws called CP (charge–parity) symmetry violation?

Baryogenesis (D) Signup and view all the answers

How are antimatter particles defined compared to 'normal' matter particles?

Negative baryon or lepton number (A) Signup and view all the answers

What is one of the great unsolved problems in physics according to the text?

The balance between matter and antimatter in the visible universe (C) Signup and view all the answers

What should happen if matter and antimatter are identical?

They should completely annihilate each other (A) Signup and view all the answers

What is the term used to describe the study of the observable universe being almost entirely matter and the speculation about other places being predominantly antimatter?

Matter-antimatter asymmetry (D) Signup and view all the answers

What do scientists believe must have occurred in the early universe based on evidence mentioned in the text?

An imbalance between matter and antimatter (C) Signup and view all the answers