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Laws of Refraction
The incident ray, the refracted ray and the normal to the surface at the point of incidence all lie in one plane. For any two given pair of media, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant. The second law is called Snell's law after the..
The incident ray, the refracted ray and the normal to the surface at the point of incidence all lie in one plane. For any two given pair of media, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant. The second law is called Snell's law after the..Structure of Atom
When scientists started exploring matter, they discovered that the smallest particle of an element that maintains its chemical identity through all chemical and physical changes is called and 'atom'. Just how small these atoms are can be made out if you realize that there are about 60,00..
When scientists started exploring matter, they discovered that the smallest particle of an element that maintains its chemical identity through all chemical and physical changes is called and 'atom'. Just how small these atoms are can be made out if you realize that there are about 60,00..Named After Scientists
Curium (Cm) after Pierre and Marie CurieFermium (Fm) after Enrico FermiEinsteinium (Es) after Albert EinsteinMendelevium (Md) after Dimitri Mendel..
Recycle and Recovery
Materials such as paper, some kinds of plastics and glass can are being recycled. Collect plastic, paper, glass and metal items and give them to people who recycle these materials. This decreases the volume of refuse and helps in the conservation of natural resources. A recove..
Question 1
Question: Why were the scientists not able to observe most of the cell organelles before 1940? Answer: Before 1940, scientists could view the cell only under a light microscope. The invention of the electron microscope in 1940 enabled the scientists to obse..
Domestic Wastes
It includes the wastes generated in houses. It includes paper, plastic, glass, ceramics, polythene, textiles, vegetable waste, et..
Periodic Classification of Elements
Initially scientists had classified elements into metal and non-metals. However, some elements possessed properties which could neither be classified as metals nor non-metals called metalloid..
Industry
Practically all industries use acids or bases in one process or the other. Major industries, which employ these are, Paper, Dyes, Ink, Paints and Drugs industrie..
Classification of Wastes
The wastes include kitchen waste, papers, construction materials, old tyres, medical wastes, et..
Periodic Classification of Elements Introduction
Introduction - At the turn of the nineteenth century, about 30 elements were known. 50 years later by the 1850s, scientists had discovered sixty three chemical elements and the numbers kept increasing. With the discovery and study of more and more elements and their compounds, the various..
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