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Tuesday, 18 December 2012

Pockels effect

Some crystals exhibit birefringence on application of electric field. This is known as Pockels effect.

Actual values of constants

Velocity of light = 2.99792 × 108 m/s
Electron mass = 9.1095 × 10-31 kg
Electron charge = 1.602 × 10-19 C

Monday, 10 December 2012

Thremionic emission

Emission of electrons from a metal surface when it is heated.


International Standards Organisation

Tuesday, 20 November 2012


Turbomachine is a rotary type device using which energy transfer is brought about by dynamic action without an impervious boundary that prevents the free flow of a liquid at any time.


Compact fluorescent lamp


Deviation from the true value of a measured variable.

Monday, 5 November 2012


Mercator is used for navigation for maps of equatorial regions. Transverse mercator is used for mapping large areas in north-south. Oblique mercator is used to show regions along a great circle other than the equator or a meridian.

Tuesday, 30 October 2012


Tungstite is a powdery and earthy mineral. Its colour is yellowish green or bright yellow. It is soluble in alkaline solutions and not soluble in acidic solutions.

Sunday, 21 October 2012


Microwaves are electromagnetic waves of wavelengths ranging from 30 cm to 0.3mm. Frequency range is 109Hz to 1012Hz.

Tuesday, 16 October 2012


The superposition of two or more light waves and redistribution of energies is termed as interference of light.

Thursday, 11 October 2012


Laser(Light Amplification by Stimulated Emission of Radiation) is a light source which gives highly directional, coherent, monochromatic, intense light.

Wednesday, 10 October 2012


Ultrasonics are sound waves with frequency greater than that of human audibility limit, 20KHz.

Tuesday, 9 October 2012


Perigee-The point in a satellite's elliptical orbit that is closest to the earth, and at which the satellite's velocity is greatest.


Fractal-a geometric shape that repeats itself, at least roughly, at all scales. Fractals are used for the complex modelling of clouds and other natural shapes.