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When metals are required in a ultra pure state, the zone refining method is used. The principle-employed states that the impurities, which lower the melting point of a metal remain preferentially dissolved in the liquid phase and purer metal will emerge in the solid phase. In actual prac..

A circular heater is fit around one end of a rod of impure germanium The heater heats a zone or band of the impure rod, it is in contact with The heated zone of germanium melts along with its impurities When the heater gradually shifts to the next zone pure ..

This occurs a little lower down the zone of elongation. Here the cells start maturing to obtain a permanent size. The thin stretched cell walls grow in thickness and then gradually undergo structural and physiological changes depending on their location in the plant. The time in..

The second planet from the sun is Venus. Venus is almost the same size as the earth, but it is surrounded by thick clouds of hot, poisonous gases. The surface of Venus is generally plain, dotted with mountains, valleys, craters and volcanoes, which may or may not be extinct. Venus It is the brighte..

. The changes that occur from time to time can also be monitored. (5) Remote sensing can also provide data related to ocean and coastal zones: The potential area of fish concentration can be identified. Environmental degradation that takes place in coastal zones..