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Chapter 12: Problem 13

What is an antiparticle? What may happen when a particle and its anti collide?

Short Answer

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Answer: An antiparticle is a subatomic particle with the same mass as its corresponding particle but has an opposite electric charge and other particle properties, such as quantum numbers. When a particle and its antiparticle collide, a process called annihilation occurs, where the sum of their energy and mass is converted into energy, typically in the form of gamma-ray photons. This process is governed by the conservation of energy and has implications in particle physics, cosmology, and practical applications like medical imaging.

Step by step solution

01

Defining an antiparticle

An antiparticle is a subatomic particle with the same mass as its corresponding particle but has an opposite electric charge and other particle properties, such as quantum numbers. Antiparticles are crucial in understanding the properties of matter and the fundamental forces that govern their behavior.
02

Describing annihilation

When a particle and its antiparticle collide, a process called annihilation occurs, where the sum of their energy and mass is converted into energy. This energy release is often in the form of photons, typically high-energy gamma-ray photons. For example, when an electron (particle) collides with a positron (antiparticle), they annihilate each other, resulting in the release of two gamma-ray photons.
03

Energy conservation in annihilation

During annihilation, the mass-energy equivalence principle, described by Einstein's famous equation E = mc^2, comes into play. The combined mass and energy of the particle-antiparticle pair are conserved and transformed into the energy of emitted photons or other particles. This conservation ensures that the total energy remains constant before and after the collision.
04

Implications of particle-antiparticle annihilation

Particle-antiparticle annihilation has several implications in particle physics and cosmology. It helps us understand the balance between matter and antimatter in the universe. Additionally, the energy released during annihilation is used in various practical applications, such as positron emission tomography (PET) scans used for medical imaging and diagnosis.

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