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= 200 Mev = 200 x 1.6 x 10 - 1 3 J = 3.2 x 10 - 1 1 J 1kW = 1000 W = 1000 Js - 1 If x be the number of fissions per second required to generate a power of 1kW, then..

Lithium - For refining copper and nickel. For producing thermo nuclear energy for propelling rockets and guided missiles. For the manufacture of various alloys such as lithium lead alloy, lithium aluminium alloy etc. Lithium and its compounds are used as reagents in a number of organic syntheses. L..

Upto the year 1924, electron was exclusively regarded as a particle. However, in 1924, de-Broglie suggested that an electron behaves both as a material particle and as a wave. Just like light, some experimental facts can be explained by assuming electrons as tiny particles while some oth..

In class III levers effort is situated between the load and the fulcrum. (shown in the figure below) ..

> How do infrared and g - rays differ in their (i) wavelength and (ii) penetrating power. Suggested Answer:- (i) g - rays have much shorter wavelengths of the order of 10 - 1 3 m while the infrared have longer wavelengths of the order of 10 - 6 or more. (ii) g - rays have a much higher pe..

Steering wheels, spanner, screw drivers and bicycle pedals all use the principle of wheel and axle. Solved Examples: Example 1 : Figure below shows the use of a lever to lift a boulder of weight 3000 N by applying a suitable effort at C. If AB = 1 m and BC = 6 m, calculate the effort required to li..

B-3 and B-4 type questions in the question paper demand long essay-type answers. Both these questions need to be answered with care and adequate preparation. Read the 'Main Course Book' completely at least once so that you can be familiar with a wide range of subjects. Answer all the 'Reading..

. The major problem of corrosion occurs with iron (or steel) as it is used as a structural material in industries like construction, infrastructure, bridges, rail transport power transmission, shipbuilding, automobiles, heavy industries etc. Aluminium, another useful structural metal, als..

Stefan-Boltzmann Law - The energy of thermal radiation emitted per unit time by a black body of surface A, is given by u = s AT 2 -----(1) where s is a universal constant known as Stefan-Boltzmann constant and T is its temperature on absolute scale. The measured value of s is 5.67 x 10 - 8 W/m 2 - ..