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? When white light passes through glass prism, a sequence of colours containing seven colours ( violet, indigo, blue, green, yellow, orange, and red) appear.

? According to the difference in the wave lengths the component colours deviate to different extents. The colour which has lowest wavelength deviates most and with highest wavelength deviates least.

? Range of visible spectrum = 400 nm – 700 nm

?Pairs that can mixed to produce white light are called the complementary colours.

?Any colour produced by the mixing of two primary colours is called Secondary colour.

? Colour which cannot be obtained by mixing other colours of light is termed primary colour of light.

Blue, Green, Red are primary colours.

In chemistry, a nucleophile is a chemical species that forms bonds with electrophiles by donating an electron pair. All molecules and ions with a free pair of electrons or at least one pi bond can act as nucleophiles. Because nucleophiles donate electrons, they are Lewis bases.

? On the basis of decreasing wave length, increasing energy and frequency the electromagnetic spectrum is generally divided into seven regions.

? Radio waves, Microwaves, Infrared, Visible region, UV, X – rays and Gamma rays.

? Range of visible spectrum = 400 nm – 700 nm

? The phenomenon of the splitting up of composite light into its component colours is known as dispersion of light.

? When a beam of white light passes through a triangular glass prism, it splits up into its component colours. It is called dispersion.

? Irregular and partial reflection of light during its passage through a medium is known as scattering of light.

? Any colour produced by the mixing of two primary colours is called secondary colour. They are cyan, yellow, magenta.

? Pairs that can mixed to produce white light are called the complementary colours.

? Colour which cannot be obtained by mixing other colours of light is termed primary colour of light.

Blue, Green, Red are primary colours.

? A pigment which can absorb only one primary colour when white light is incidented called a primary pigment. They are magenta, cyan and yellow.

? Colour which cannot be obtained by mixing other colours of light is termed primary colour of light.

? Blue, Green, Red are primary colours.

? The unit of sound level is decibel (db) . This can be measured by an instrument called decibel meter.

? Sound higher than 120 db are painful to the ear.

? The permissible sound limit in various occasions

? Silence zone in daytime = 50db, Night= 40 db

? Residential areas Daytime- 55 db Night time- 45 db

?Commercial area Daytime- 65 db Night time- 55db

? Industrial area Day time -75db Night time -70 db

? Charle’s law states that at constant pressure, the volume of a given mass of gas is directly proportional to its temperature in kelvin scale .

? Acoording to Charle’s law V is directly proportional to T.

? Deodorant Spray Bottle , Pool Float, Helium Balloon are the applications of charle’s law.

In contact process alkali is used as promoter in trace amounts to enhance activity of catalytic agent in order to decrease the reaction time for better economy.

The function of the promoter is to lower the melting point of vanadium(V) oxide so that it is molten at 700 K.

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