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Meghna Thapar 6 years, 1 month ago
- Rapid combustion: The combustion reaction in which a large amount of heat and light are produced in a short time is called rapid combustion. The immediate burning of cooking gas (LPG) in a gas stove to give heat and light is an example of rapid combustion.
- Spontaneous combustion: The type of combustion in which a material suddenly bursts into flames, without the application of any apparent cause is called spontaneous combustion. The spontaneous combustion reactions which take place in nature are very dangerous. Forest fires can be started by spontaneous combustion reaction.
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The angle between incident and the reflected ray will be 0 degrees. The angle between the incident ray and the mirror is called angle of incidence while the angle between reflected ray and the normal is called angle of reflection. Here, the a ray of light is incident normally on a plane mirror. When a ray of light falls normally on the surface of a plane mirror , the following things happen: 1. Incident ray is reflected back along the same path. Angle if incidence is zero and angle of reflection will be zero.
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Gaurav Seth 7 years, 2 months ago
Tribal societies were absolutely different from those which existed in big cities. They did not follow the social rules and rituals, prescribed by the Brahmanas because they divided societies into numerous unequal classes. These societies were known as tribes. There was a unique bond of kinship among the members of each tribe.
Their main source of livelihood was agriculture. However, hunter-gatherers or herders were also there. Some tribes were nomadic and kept on moving from one place to another. Many large tribes lived in forest, hills, deserts, and places difficult to reach.
The major characteristics of the tribal societies are as follows:
- Tribal societies are completely united by the kinship bonds.
- Few traits like Strong, complex, formal organization were absent in tribal societies.
- Tribal societies have a communitarian basis of landholding.
- In tribal societies, there is no hierarchy among men and groups in tribal societies.
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Yogita Ingle 7 years, 2 months ago
Diffused Reflection: When light falls on a rough surface (like a stone, your body, your clothes etc), all the parallel incident rays are not reflected parallel to each other. This is called Diffused Reflection. It. takes place on a rough surface.
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Jasmitha Do Your Best 7 years, 2 months ago
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