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The Theoretical Minimum. Physics Homework Help, Physics Help, Physics Tutors. Practical Physics. This website is for teachers of physics in schools and colleges.

Practical Physics

It is a collection of experiments that demonstrate a wide range of physical concepts and processes. Some of the experiments can be used as starting-points for investigations or for enhancement activities. Many have links to carefully selected further reading and all include information and guidance for technicians. Physics is a practical science. Practical activities are not just motivational and fun: they can also sharpen students’ powers of observation, stimulate questions, and help develop new understanding and vocabulary. Good quality, appropriate physics experiments and investigations are the key to enhanced learning, and clarification and consolidation of theory. We have published a new set of resources to support the teaching of practical science for Key Stages 3-5.

MathAppendices. PhysicsCentral: Learn How Your World Works. Physics Documents. The laws list. Science in the News. Top 10 Most Extreme Substances. Chapter 3. Classical physics could not explain the spectra of black bodies.

Chapter 3

It predicted that the intensity (power emitted at a given wavelength) of emitted light should increase rapidly with decreasing wavelength without limit (the "ultraviolet catastrophe"). In the figure below, the curve labeled "Rayleigh-Jeans law" shows the classically expected behavior. However, the measured spectra actually showed an intensity maximum at a particular wavelength, while the intensity decreased at wavelengths both above and below the maximum. In order to explain the spectra, in 1900 the German physicist Max Planck (1858 - 1947) was forced to make a desperate assumption for which he had no physical explanation. As with classical physics, he assumed the body consisted of vibrating oscillators (which were actually collections of atoms or molecules).

E = hf (Planck's formula) In classical physics, the electromagnetic field connects charged particles to each other (see Sections 2.4, 2.6). 3.2. L=h/p 3.3. 10 Strange Things About The Universe. Space The universe can be a very strange place.

10 Strange Things About The Universe

While groundbreaking ideas such as quantum theory, relativity and even the Earth going around the Sun might be commonly accepted now, science still continues to show that the universe contains things you might find it difficult to believe, and even more difficult to get your head around. Theoretically, the lowest temperature that can be achieved is absolute zero, exactly ?

273.15°C, where the motion of all particles stops completely. However, you can never actually cool something to this temperature because, in quantum mechanics, every particle has a minimum energy, called “zero-point energy,” which you cannot get below. One of the properties of a negative-energy vacuum is that light actually travels faster in it than it does in a normal vacuum, something that may one day allow people to travel faster than the speed of light in a kind of negative-energy vacuum bubble. Relativity of Simultaneity Antimatter Retrocausality. Physics Formulary: Table of Contents. Last change: December 16, 2009 This document is a LaTeX file of 108 pages which contains a lot of equations in physics.

Physics Formulary: Table of Contents

It is written at advanced undergraduate/postgraduate level. It is intended to be a short reference for anyone who works with physics and often needs to look up equations. Math, Physics, and Engineering Applets. Controlled Demolition, Inc. Physics. College Physics. Henry Greenside's Duke Physics Challenges. Duke Physics Challenges The following Physics Challenges are for Duke undergraduates and others to enjoy.

Henry Greenside's Duke Physics Challenges

The motivation for these problems comes from Mark Twain's famous quip that "I have never let my schooling interfere with my education. " and similarly I think physics is too much fun to restrict just to classrooms, labs, and homework assignments. If you would like to propose a solution to a Challenge, talk about one of the Challenges, or get a hint, please send me e-mail at or drop by my office in the Physics building, Room 097. Please also forward to me any neat problems that you find or invent that would be fun to present as a challenge. References and links to other collections of physics problems and challenges can be found here. Challenge 1 Heating of Two Identical Balls You are given two identical steel balls of radius 5 cm.

Challenge 2 Let Go or Hang On? Challenge 3 How to knock a bottle over with a sandbag and drinking straw. Challenge 11 Spherical Thinking. Evol_massive5. E X P E R I E N C E. Tutorials Sicene. Motion Mountain - The Free Physics Textbook for Download. Free video lectures, Free Online Courses, Video Lessons, Lecture Videos, Tutorials, free Download from top colleges and universities. Table/Constants.html.