Physics

Superfluids and Superconductors

Superfluids and Superconductors Superfluids: Superfluidity, the frictionless flow and other exotic behaviour observed in liquid helium at temperatures near absolute zero (−273.15 °C, or −459.67 °F), and (less widely used) similar frictionless behaviour of electrons in a superconducting soli.....

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Distant Supernovae

Distant Supernovae The Hubble Space Telescope images pinpoint three distant supernovae, which exploded and died billions of years ago. Scientists are using these faraway light sources to estimate if the universe was expanding at a faster rate long ago and is now slowing down. Since the discovery .....

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Laser Spectroscopy

Laser Spectroscopy Laser spectroscopy has led to advances in the precision with which spectral line frequencies can be measured, and this has fundamental significance for our understanding of basic atomic processes. This precision has been obtained by passing two laser beams through the absorptio.....

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Neutron Spectroscopy

Neutron Spectroscopy Neutron Spectroscopy measures the atomic and magnetic motions of atoms. Neutron scattering is a powerful tool for the investigation of microscopic properties of solids, liquids, soft materials, biological objects etc. – condensed matter, in general as well as for non-de.....

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Ion Trap Technique

Ion Trap Technique It is now more than 20 years since the first reviews of ion traps appeared (Dehmelt 1967, 1969). Since that time, the ion trapping technique has been applied to many different kinds of problems in physics, ranging from precise RF spectroscopy to studies of the anisotropy of spa.....

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The Quantum Theory of Optical Coherence

The Quantum Theory of Optical Coherence In the early sixties Roy was drawn into a completely different topic. He developed the quantum theory of optical coherence and photon detection, for which he was finally awarded the Nobel Prize in 2005. In this way he laid the foundations for modern quantum.....

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Giant Magnetoresistance

GMR: Giant Magnetoresistance Since discovery in 1988 GMR has generated a lot of interest among academic and industrial laboratories due to deep fundamental physics that controls this phenomenon and tremendous technological potential for magnetic recording, storage and sensor industries. In 2007 A.....

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Causes of Astroid Belt

The asteroid belt is a area of space between the orbits of Mars and Jupiter where the majority of the asteroids in our Solar System are found orbiting the Sun. The asteroid belt possibly contains millions of asteroids. Astronomers think that the asteroid belt is made up of material that was never.....

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How Old is the Universe?

The age of the universe is approximately 13.77 billion years. This age is considered by measuring the distances and radial velocities of other galaxies, most of which are flying away from our own at speeds proportional to their distances. Using the present expansion rate of the universe, we can i.....

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Lecture on Lise Meitner

Lise Meitner (1878 – 1968) Austrian-born Swedish nuclear physicist. Born in Vienna, she worked with radiochemist, Otto Hahn. They discovered the element protactinium and studied the effects of neutron bombardment on uranium. After leaving Nazi Germany in 1938, she continued her work at the .....

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Presentation on Marie Curie

Marie Curie (1867 -1934) was a Polish-born physicist and chemist, working mainly in France, who is famous for her pioneering research on radioactivity. Not only was she the first person to win two Nobel prizes, she was the first woman to win a Noble prize. Curie’s efforts, with her husband .....

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Presentation on Max Planck

Max Karl Ernst Ludwig Planck (1858 – 1947), was a German theoretical physicist who originated quantum theory, which won him the Nobel Prize in Physics in 1918. This was not only Planck’s most important work but also marked a turning point in the history of physics. A constant (Planck’s .....

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