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Sia ? 6 years, 5 months ago
The concept of possibilism was propounded by Lucian Febure, who described that there are no necessities but possibilities everywhere and man is referred to as a master of these possibilities who judged their use. According to possibilism, man can adapt, adjust and modify the forces of his physical environment with his strength.
For instance, a health resort on highlands, huge urban sprawls (spread) fields, orchards and pastures in plains and rolling hills, ports on the coasts, oceanic routes on the oceanic surface and satellites in the space.
However, if a man will keep on exploiting nature for its selfish needs, a time will come when a man has to pay for his deeds.
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Sia ? 6 years, 5 months ago
You can check syllabus here : https://mycbseguide.com/cbse-syllabus.html
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Pakmir Muri 6 years, 5 months ago
Yogita Ingle 6 years, 5 months ago
Brunner's glands are the glands present in the walls of the duodenum, a part of small intestine.
Posted by Prakash Tripathi 6 years, 5 months ago
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Yogita Ingle 6 years, 5 months ago
{tex}\ {1.057 \times 10^{-16}}{/tex} light years are there in 1 meter.
The value of light years in terms of meter is based upon the conversion factor as both are the measure of distance being the fundamental quantity. There are 7 fundamental quantities of which length is the fundamental quantity and measure of length is known as distance. Light years and meter both are units of distance.
{tex} 1 \text { light year }=9.46 \times 10^{-15}.{/tex}
Thereby, {tex}1 \text { meter }=\frac{1}{9.46 \times 10^{-15}}\ \text{light year}{/tex}
{tex}\Rightarrow 1 \text { metre }=1.057 \times 10^{-16}\ \text{Light years}.{/tex}
Posted by Karuna Kumari 6 years, 5 months ago
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Yogita Ingle 6 years, 5 months ago
Bohr model of the atom was proposed by Neil Bohr in 1915. It came into existence with the modification of Rutherford’s model of an atom. Rutherford’s model introduced the nuclear model of an atom, in which he explained that a nucleus (positively charged) is surrounded by negatively charged electrons. Bohr modified this atomic structure model by explaining that electrons move in fixed orbital’s (shells) and not anywhere in between and he also explained that each orbit (shell) has a fixed energy level. Rutherford basically explained nucleus of an atom and Bohr modified that model into electrons and their energy levels.
Postulates of Bohr’s Model of an Atom
- In an atom, electrons (negatively charged) revolve around the positively charged nucleus in a definite circular path called as orbits or shells.
- Each orbit or shell has a fixed energy and these circular orbits are known as orbital shells.
- The energy levels are represented by an integer (n=1, 2, 3…) known as the quantum number. This range of quantum number starts from nucleus side with n=1 having the lowest energy level. The orbits n=1, 2, 3, 4… are assigned as K, L, M, N…. shells and when an electron attains the lowest energy level it is said to be in the ground state.
- The electrons in an atom move from a lower energy level to a higher energy level by gaining the required energy and an electron moves from a higher energy level to lower energy level by losing energy.
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Sia ? 6 years, 5 months ago
क्षेत्रीय निरंतरा मॉडल के अनुसार अनेक क्षेत्रों में अलग- अलग मनुष्यों की उत्पत्ति हुई
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Sia ? 6 years, 5 months ago
A divisibility rule is a shorthand way of determining whether a given integer is divisible by a fixed divisor without performing the division, usually by examining its digits.
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Divyanshi Agrawal 6 years, 5 months ago
1Thank You