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Posted by Thom Gaming Yt 6 years, 1 month ago
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Reflection is when light bounces off an object. If the surface is smooth and shiny, like glass, water or polished metal, the light will reflect at the same angle as it hit the surface. This is called specular reflection. Diffuse reflection is when light hits an object and reflects in lots of different directions. This happens when the surface is rough. Most of the things we see are because light from a source has reflected off it.
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Posted by Simran Patial 6 years, 1 month ago
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Yogita Ingle 6 years, 1 month ago
Carbon forms large no. of compounds due to the following reasons:
- Catenation: The property of carbon element due to which its atoms can join one another to form long carbon chains is called catenation.
- Tetravalency: Carbon has a valency of four. So, it is capable of bonding with four other atoms of carbon or atoms of some other mono-valent element.Compounds of carbon are formed with oxygen, nitrogen, hydrogen, sulphur, chlorine and many other elements, giving rise to compounds with specific properties which depend on the elements other than the carbon present in the molecule.
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Brisk effervescence is defined as the rapid or vigorous evolution of a gas in a chemical reaction. For example, when hydrochloric acid is added to sodium bicarbonate, bubbles of carbon dioxide gas are formed vigorously.
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Posted by Palak Sharma 6 years, 1 month ago
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Yogita Ingle 6 years, 1 month ago
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Calcination |
Roasting |
|
Calcination is a process in which an ore is heated in the absence of air or air might be supplied in limited quantity |
Roasting involves heating of ore higher than its melting point in the presence of air or oxygen. |
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Calcination involves thermal decomposition of carbonate ores. |
Roasting is carried out mostly for sulfide minerals. |
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During calcination moisture is driven out from an ore. |
Roasting does not involve dehydrating an ore. |
|
Carbon dioxide is given out during calcination |
During roasting large amount of toxic, metallic and acidic compounds are released. |
Shubham Kumar 6 years, 1 month ago
Posted by Class 12 6 years, 1 month ago
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Meghna Thapar 6 years, 1 month ago
Within the lungs, the passage divides into smaller and smaller tubes which finally terminate in balloon-like structures which are called alveoli. The alveoli provide a surface where the exchange of gases can take place. The walls of the alveoli contain an extensive network of blood-vessels. When we breathe in, the ribs are lift up and the diaphragm flattens which increases the size of the chest cavity. Because of this, air is sucked into the lungs and fills the expanded alveoli.
Yogita Ingle 6 years, 1 month ago
Alveoli are the tiny air sacs (only 1 cell thick) in the lungs at the end of the smallest airways, where the exchange of oxygen and carbon dioxide takes place. The average human has nearly 300 million alveoli to absorb oxygen from the air.
Function of alveoli
The function of the alveoli is to get oxygen into the blood stream for transport to the tissues, and to remove carbon dioxide from the blood stream.
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Posted by Akash Rai 6 years, 1 month ago
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A primary *** organ is one of the anatomical parts of the body which is involved in sexual reproduction and constitutes the reproductive system in a complex organism.
Secondary *** organs are features that distinguish the two sexes of a species, but that are not directly part of the reproductive system.
Posted by Akash Rai 6 years, 1 month ago
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Grahul 📒🎒📓📔🙇🙇🙇 Rahul 6 years, 1 month ago
Yogita Ingle 6 years, 1 month ago
Refractive index is defined as: The ratio of speed of light in vacuum to its speed in a specific medium.
The speed of light in a medium depends on the properties of the medium. In electromagnetic waves, the speed is dependent on the optical density of the medium. Optical density is the tendency of the atoms in a material to restore the absorbed electromagnetic energy. The more optically dense material is, the slower the speed of light. One such indicator of the optical density of a medium is the refractive index.
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