classical physics

Examples of classical physics in the following topics:

• Introduction: Physics and Matter

  • Physics is a natural science that involves the study of matter and its motion through space and time, along with related concepts such as energy and force .
  • Many concepts integral to the study of classical physics involve theories and laws that explain matter and its motion.
  • In fact, almost everything around you can be described quite accurately by the laws of physics.
  • Consider a smart phone; physics describes how electricity interacts with the various circuits inside the device.
  • Andersen explains the importance of physics as a science.

• Late Classical Period

  • Late Classical sculpture began to examine new subjects and emotions by creating elements of narrative and incorporating the viewer.
  • The Late Classical period covers the last decades of the Classical periods in the fourth century BCE before the conquest of Greece by Philip II of Macedon and the beginning of the Hellenistic period following the death of Alexander the Great.
  • Art from 400 to 323 BCE began to push at the boundaries created by Classical artists.
  • At this point, the physical form of the body was nearly as naturalistic as it could be.
  • However, there had been a fundamental shift away from the fierce independence and classical culture of the Ancient Greek city-states, and instead toward the developing Hellenistic culture.

• The Bohr Model of the Atom

  • Bohr suggested that electrons in hydrogen could have certain classical motions only when restricted by a quantum rule.
  • From their sizes to their spectra, much was known about atoms, but little had been explained in terms of the laws of physics.
  • He suggested that electrons could only have certain classical motions:
  • In these orbits, the electron's acceleration does not result in radiation and energy loss as required by classical electrodynamics.
  • His many contributions to the development of atomic physics and quantum mechanics; his personal influence on many students and colleagues; and his personal integrity, especially in the face of Nazi oppression, earned him a prominent place in history.

• Further Reading

• Further Reading

• Further Reading

• Bibliography

  • Lectures on Physics.
  • Classical electromagnetic radiation.

• Atomic Structure

  • So far we have used classical and semi-classical approaches to understand how radiation interacts with matter.
  • We have generally treat the electrons (the lightest charged particle so the biggest emitter) classically and the radiation either classically or as coming in quanta (i.e. semi-classically).
  • We can imagine the operator $H$ as a matrix that multiplies the state vector $\psi$, so this equation is an eigenvalue equation with $E$ as the eigenvalue and $\psi$ as an eigenvector (or eigenfunction) of the matrix (or operator) $H$.The Hamiltonian classically is the sum of the kinetic energy and the potential energy of the particles.

• Further Reading

• Oscillator Strengths

  • A classical harmonic oscillator driven by electromagnetic radiation has a cross-section to absorb radiation of
  • We can write the Einstein coefficients in term of this classical one
  • $\displaystyle f_{if} = \frac{B_{if}}{B_{if}^\mbox{classical}} = \frac{2 m }{3 \hbar^2 g_i e^2} \left ( E_f - E_i \right ) \sum |{\bf d}_{if}|^2$