LASER

Light Amplification by Stimulated Emission of Radiation(LASER) is a device that emits light. It is done by a process known as optical amplification where there is stimulated emission of photons. The gain medium is a material with properties that allow it to amplify light by stimulated emission.A laser consists of a gain medium inside a highly reflective optical cavity, as well as a means to supply energy to the gain medium.  In...

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Plasma - The 4th state of Matter

Plasma is a state of matter similar to gas in which a certain portion of the particles are ionized. After sufficient heating a gas dissociates its molecular bonds, rendering it into constituent atoms. Further heating leads to ionization (a loss or gain of electrons), thus turning it into a plasma, containing charged particles: positive ions also called cations or negative...

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Special article: Time Dialation

Time dilation is an observed difference of elapsed time between two observers which are moving relative to each other, or being differently situated from nearby gravitational masses. An observer will see the other observer's clock ticking at a slower rate than his/hers. This effect doesn't arise from technical aspects of the clock or the fact that any signal needs time to propagate, but from the nature of space-time described by the theory...

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