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Modern Physics

Helium (he) Neon (ne) laser working animation

Helium-Neon Laser A helium-neon laser, usually called a HeNe laser, is a small gas laser. Its usual operation wavelength is 632.8 nm, in the red portion of the visible spectrum. Construction:   Working: It is most common type of a lasers used in physics laboratories. Its discharge tube is fitted with 80% helium and 20% neon gas. The neon is ...

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uses of laser in daily life

List of uses of laser and applications in the field of medicine,industry and agriculture The intensed heat produced in small area by a laser beam is also used for welding and matching metals and for drilling tiny holes in hard material. The precise straightness of a laser beam is also useful to surveyors for lining up equipment especially in inaccessible ...

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uses and applications of x rays waves in everyday life

Uses of gamma rays in everyday life 1:Radio Therapy X-rays kill the diseased tissues of the body.Hence they are used to λ cure intractable skin diseases,malignant tumours etc.If the affected part is superficial soft rays are applied and for deep seated organs hard rays are used. 2:Engineering Because of their high penetrating power they are used ti investigate the structure of ...

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Plasma physics and controlled fusion energy

Plasma physics definition “The branch of physics which deals with the study of the properties of plasma is known as plasma physics.” Plasma definition A highly ionised gas is regarded as a fourth state of matter called the plasma state.It is regarded as fourth state of matter since it is not solid,liquid or gas in usual sense. How plasma is ...

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Is an electron a particle or a wave?

In 1924,de Broglie proposed that particle acts as a wave and wave acts as a particle. Davisson and Germer experimentally confirmed the wave nature of electron.They showed that electrons are diffracted from metallic crystal in the same manner as x-rays and other wave.Hence electrons show wave like properties.J.J Thomson while measuring e/m of electron showed that electron is a particle.Thus ...

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Does a photon have a de Broglie wavelength?

Yes a photon has de Broglie wavelength.In 1924,Louis de Broglie proposed that a particle must also act like wave,in silmilar way,wave behave like particles. In de Broglie hypothesis an electromagnetic wave is the de-Broglie wave for a photon moving with speed c.According to de-Broglie ,the wavelength of the photon is given by the relation: λ = h/p Where P is ...

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X rays uses,properties and applications

What are X rays ? X-rays are the electromagnetic waves which are emitted by the atoms of those metals which have large atomic number,large number of protons in their nuclei so that the pull of the nuclei on their electrons is very large.When an electron of K or L shell of such an atom is displaced from these shells to ...

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Properties of alpha, Beta and Gamma rays with uses and differences

What is radioactivity? In the March 1896 Henri Becquerel announced the discovery of radioactivity similar to X-rays.Although rays (X-rays) had been discovered less than four month earlier it was already known that X-rays come from the fluorescence wall of the discharge tube and thus it was thought that fluorescence and phosphorescence might be responsible for them. Becquerel known that Uranium ...

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Thermal radiation:Definition,examples and properties

Thermal radiation Radiation emitted by such a body due to its temperature is called thermal radiation.All bodies not only emit such radiation but also absorb it from their surroundings.If the rate of absorption and emission from a body become equal ,the body is said to be in thermal equilibrium with its surroundings. The spectrum of thermal radiation from a hot ...

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What is Photovoltaic effect?

Photovoltaic effect An effect arising when a junction exists between two dissimilar materials and one of the materials is exposed to electromagnetic radiation,usually in the range near ultraviolet to infrared.The two materials may,for example,be a metal and a semiconductor or two semiconductors of opposite polarity,the combination forming a Schottky barrier and a P-N junction respectively.A forward voltage appears across the ...

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