Experimental physics

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Experimental physics is the category of disciplines and sub-disciplines in the field of physics that are concerned with the observation of physical phenomena and experiments. Methods vary from discipline to discipline, from simple experiments and observations, such as Galileo's experiments, to more complicated ones, such as the Large Hadron Collider.

Overview

Sir Ernest Rutherford's laboratory, early 20th century. (9660575343)

Experimental physics is a branch of physics that is concerned with data acquisition, data-acquisition methods, and the detailed conceptualization (beyond simple thought experiments) and realization of laboratory experiments. It is often contrasted with theoretical physics, which is more concerned with predicting and explaining the physical behaviour of nature than with acquiring empirical data.

Although experimental and theoretical physics are concerned with different aspects of nature, they both share the same goal of understanding it and have a symbiotic relationship. The former provides data about the universe, which can then be analyzed in order to be understood, while the latter provides explanations for the data and thus offers insight into how to better acquire data and set up experiments. Theoretical physics can also offer insight into what data is needed in order to gain a better understanding of the universe, and into what experiments to devise in order to obtain it.

History

As a distinct field, experimental physics was established in early modern Europe, during what is known as the Scientific Revolution, by physicists such as Galileo Galilei, Christiaan Huygens, Johannes Kepler, Blaise Pascal and Sir Isaac Newton. In the early 17th century, Galileo made extensive use of experimentation to validate physical theories, which is the key idea in the modern scientific method. Galileo formulated and successfully tested several results in dynamics, in particular the law of inertia, which later became the first law in Newton's laws of motion. In Galileo's Two New Sciences, a dialogue between the characters Simplicio and Salviati discuss the motion of a ship (as a moving frame) and how that ship's cargo is indifferent to its motion. Huygens used the motion of a boat along a Dutch canal to illustrate an early form of the conservation of momentum.

Experimental physics is considered to have reached a high point with the publication of the

fundamental force of gravity. Both laws agreed well with experiment. The Principia also included several theories in fluid dynamics
.

From the late 17th century onward, thermodynamics was developed by physicist and chemist Robert Boyle, Thomas Young, and many others. In 1733, Daniel Bernoulli used statistical arguments with classical mechanics to derive thermodynamic results, initiating the field of statistical mechanics. In 1798, Benjamin Thompson (Count Rumford) demonstrated the conversion of mechanical work into heat, and in 1847 James Prescott Joule stated the law of conservation of energy, in the form of heat as well as mechanical energy. Ludwig Boltzmann, in the nineteenth century, is responsible for the modern form of statistical mechanics.

Besides classical mechanics and thermodynamics, another great field of experimental inquiry within physics was the nature of

theory of the atom
.

It was

laws of physics
which were enunciated and improved in the succeeding centuries. By the 19th century, the sciences had segmented into multiple fields with specialized researchers and the field of physics, although logically pre-eminent, no longer could claim sole ownership of the entire field of scientific research.

Current experiments

A view of the CMS detector, an experimental endeavour of the LHC at CERN.

Some examples of prominent experimental physics projects are:

  • Relativistic Heavy Ion Collider which collides heavy ions such as gold ions (it is the first heavy ion collider) and protons, it is located at Brookhaven National Laboratory, on Long Island, USA.
  • HERA, which collides electrons or positrons and protons, and is part of DESY, located in Hamburg
    , Germany.
  • LHC, or the Large Hadron Collider, which completed construction in 2008 but suffered a series of setbacks. The LHC began operations in 2008, but was shut down for maintenance until the summer of 2009. It is the world's most energetic collider upon completion, it is located at CERN, on the French-Swiss border near Geneva. The collider became fully operational March 29, 2010 a year and a half later than originally planned.[1]
  • LIGO, the Laser Interferometer Gravitational-Wave Observatory, is a large-scale physics experiment and observatory to detect cosmic gravitational waves and to develop gravitational-wave observations as an astronomical tool. Currently two LIGO observatories exist: LIGO Livingston Observatory in Livingston, Louisiana, and LIGO Hanford Observatory near Richland, Washington.
  • JWST, or the James Webb Space Telescope, launched in 2021. It will be the successor to the Hubble Space Telescope. It will survey the sky in the infrared region. The main goals of the JWST will be in order to understand the initial stages of the universe, galaxy formation as well as the formations of stars and planets, and the origins of life.
  • Mississippi State Axion Search (2016 completion), Light Shining Through a Wall Experiment (LSW); EM Source: .7m, 50W continuous radio wave emitter[2]

Method

Main article: Experiment

Experimental physics uses two main methods of experimental research,

celestial objects
where control of the variables in effect is impossible.

Famous experiments

Main article: List of experiments in physics

Famous experiments include:

Experimental techniques

Some well-known experimental techniques include:

Prominent experimental physicists

Famous experimental physicists include:

Timelines

See the timelines below for listings of physics experiments.

See also

References

  1. ^ "Yes, we did it!". CERN. 2010-03-29. Retrieved 2010-04-16.
  2. ^ The Construction of Mississippi State Axion Search

Further reading

  • Taylor, John R. (1987). An Introduction to Error Analysis (2nd ed.). University Science Books.
    ISBN 978-0-935702-75-0
    .

External links
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