pa emission

The gases containing dust are passed through a porous medium. which is usually woven fabrics. The particles present in the gas are trapped and collected in the filters. The gases freed from the particles are then discharged. A Typical Bag Filt..

During radioactive emissions, the product formed as a result of the emission of an a - particle followed by the emission of two b - particles is an isotope of the parent elemen..

These are the dark lines observed in otherwise continuous spectrum of the sun. When continuous light of all wavelengths from the sun's atmosphere passes through its outer layers, certain wavelengths are absorbed by elements present in this layer and hence the dark lines are present in spectrum of ..

Carbon-14 is unstable and decays by beta emissions to nitrogen. Because of the constant production of carbon-14 and its radioactive decay, a small fractional abundance of carbon-14 is maintained in the atmosphere. Living plants, which use carbon dioxide from the atmosphere, also maintain ..

Two of the important oxides of sulphur are sulphur dioxide and sulphur trioxide. Sulphur dioxide is formed by burning sulphur in air or roasting metal sulphides in the presence of air. A large amount of SO 2 gas is released into the atmosphere from coal and oil based power plants, oil-refinery..

A report by scientists at the United Nations Environment Program (UNEP) said the Asian Brown haze is a three kilometer deep blanket of pollution in the sky, which stretches across South Asia, and has been caused by the spectacular economic development experienced by this part of the world. Th..

In 1885, Sir William Crookes carried out a series of investigations into the behaviour of metals heated in a vacuum. The experiment of Crookes and others showed that a heated cathode produced a stream of radiation, which could cause gases at low pressure to glow and which made other substances emi..

. to reduce the dependence on hydrocarbon fuels. A related aspect of management of these resources is the emissions they create in terms of pollution levels and green house gases. The choice of efficient technology or alternate fuel and technologies/products has a direct bearing on t..

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 - ..

. He conducted the famous discharge tube experiment by passing electricity at high voltage through a gas at low pressure. A common discharge tube is a long glass tube having two metal plates, sealed at its two ends as electrodes. It has a side tube through which air can be pumped out by using ..