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Ultraviolet Radiations : The ultraviolet (UV) light has higher energy than visible light. Hydrogen lamps, deuterium lamps and other sources of ultra-violet are used for a variety of purposes in physical, chemical and biological laboratories. These applications include spectroscopy. The sterilisation of instruments, the initiation of chemical reactions and the detection of purines and other substances which fluoresce when irradiated with UV light in chromatography and other separation techniques. Ultraviolet sources may be recognised by their intense pale blue illumination, for example mercury vapour lamps and high voltage sparks and arc emitted at the time of welding.
Explain Light source - Pre-requisites of Colour Perception No colour may be detected by the eyes or by an instrument in the dark i.e. in the absence of a light source emitti
Explain Extrasystole and Compensatory Pause During the relaxation period, cardiac muscle is in the relative refractory period i.e. sleeping but only just. If a sufficiently st
tissue experiment conclusion
Another balloon experiment Stretch a rubber balloon over the neck of a little bottle. Place it in the receiver jar and delete some of the air with the pump. What happens? How d
Essential nutrients: Our body is a biochemical factory which can make many compounds for its needs. However, there are limits to this, and what our body cannot make has to be
Poisons : It is essential that all dangerous substances, such as cyanides, are always kept under strict control. Steps to ensure such control are as follows: i) All substances
TO LEARN THE USE OF A CARBON DIOXIDE FIRE EXTINGUISHER : All chemical laboratories should be provided with carbon dioxide and or dry chemical fire extinguishers. Carbon dioxide fi
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Freezing by Contact with a Cooled Gas Different methods are available for freezing by contact with cooled gas. These include: i) Cabinet Freezing: This method involves ci
Radiation: High doses of radiation are very harmful for human health. Do you know about the disaster ceated by the first atomic bombs which were exploded on two cities of Japa
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