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Meghna Thapar 5 years, 9 months ago
The dispersion occurs in prism but not in glass slab because of the geometric design. ... They travel a very small distance in the glass slab to meet the second interface. But, after being refracted through the second interface, all colours start moving parallel to each other which recombine together to give white light. After refraction at two parallel faces of a glass slab, a ray of light emerges in a direction parallel to the direction of incidence of white light. As rays of all colours emerge in the same direction, i.e., the direction of the incidence of white light, there is no dispersion.
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Ram Kushwah 7 years, 2 months ago
radius of semi circle
{tex}\begin{array}{l}\frac12\mathrm{πr}^2\\=\frac12\times\frac{22}7\times9\times9=\frac{11\times81}7=127.28\;\mathrm{cm}^2\\\end{array}{/tex}
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Rajesh Shriwastava 7 years, 2 months ago
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Meghna Thapar 5 years, 9 months ago
The ears are the sense organs which help us in hearing sound. It consists of three compartments – outer ear, middle ear and inner ear.
i. The outer ear consists of a broad part called pinna having a long passage called ear canal. At the end of the ear canal is a thin, elastic and a circular membrane called ear drum. It is also called tympanum. The outer ear contains air.
ii. The middle ear contains three small and delicate bone called hammer, anvil and stirrup. These bones are linked to one another. The middle ear transmits the amplified pressure variations received from the sound wave to the inner ear.
iii. In the inner ear, the pressure variations are turned into electrical signals by the cochlea. These electrical signals are sent to the brain via the auditory nerve, and the brain interprets them as sound.
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Meghna Thapar 6 years, 1 month ago
Some of the beneficial effects of microorganisms are as follows:
- Microorganisms are used in the production of alcohol, wine and acetic acid.
- They are used in making curd, bread and cake.
- They are used in the preparation of medicines called antibiotics.
- They are used in agriculture to increase the fertility of soil by fixing atmospheric nitrogen gas.
- They clean up the environment by decomposing the organic matter of dead plants, dead animals and animal wastes into harmless and useful simple substances.
Posted by Aniket Tiwari Aniket Tiwari 7 years, 2 months ago
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Meghna Thapar 5 years, 9 months ago
It is necessary to separate the oxygenated blood from mixing with deoxygenated blood as mammals and birds have high energy needs because they constantly require energy to maintain their body temperature.
Amphibians and many reptiles have three chambered heart. They can tolerate some mixing of the oxygenated and de-oxygenated blood streams. The fish has a two chambered heart. Oxygenation of the blood takes place in the gills. The oxygenated blood from the gills is supplied to the body parts of the fish where oxygen is utilized and carbon dioxide enters into it making it deoxygenated. The deoxygenated blood returns to the heart to be pumped into gills again.
Thus, single circulation is a type of circulatory system in which the blood passes through the heart only once in one complete cycle of the body.
Double circulation is a circulatory system in which the blood travels twice through the heart in one complete cycle of the body.
Posted by Gurdeep Singh 7 years, 2 months ago
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Gaurav Seth 7 years, 2 months ago
Nuclear membrane is the membrane that surrounds the nucleus. It separates the nucleus from cytoplasm. The nuclear
membrane is porous membrane is also porous and allows the movement of materials between the cytoplasm and the
inside of the nucleus.
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Mabiya Ali 7 years, 2 months ago
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Posted by Jerin Peter 7 years, 2 months ago
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Gaurav Seth 7 years, 2 months ago
Microorganisms are friendly as well as harmful. Friendly Microorganisms:Microorganisms are used for various purposes by human beings as well as in nature. Some of the beneficial effects of microorganisms are as follows: i. Microorganisms are used in the production of alcohol, wine and acetic acid. ii. They are used in making curd, bread and cake. iii. They are used in the preparation of medicines called antibiotics. iv. They are used in agriculture to increase the fertility of soil by fixing atmospheric nitrogen gas. v.They clean up the environment by decomposing the organic matter of dead plants, dead animals and animal wastes into harmless and useful simple substances.
Posted by Nagen Rout 7 years, 2 months ago
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Priti Nikshe 7 years, 2 months ago
1Thank You