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Sia ? 6 years, 5 months ago
Lyman series, n = 2, 3, 4... to n= 1
For short wavelength, n ={tex}\infty{/tex} to n = 1
we know that ,
{tex}E = \frac { 12375 } { \lambda ( \mathop A\limits_{}^o ) } = \frac { 12375 } { 9134 } \mathrm { eV } = 13.54 \mathrm { eV }{/tex}
Energy of nth orbit, E = 13.54/n2
So, energy of n = 1, energy level = 13.54eV
Energy of n = 2, energy level= 13.54/22 = 3.387 eV
So, short wavelength of Balmer series = {tex}\frac { 12375 } { 3.387 }{/tex} = 3653 {tex}\mathop A\limits_{}^o {/tex}
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Hominids have evolved from hominoids and share certain common features, but there are major differences as well:
| Hominoids | Hominids |
| By about 24 mya, there emerged a subgroup amongst primates, called Hominoids.This included apes. | By about 5.6 mya, we find evidence of the first hominids |
| Hominoids have a smaller brain than hominids. They are quadrupeds, walking on all fours, but with flexible forelimbs. | Hominids have an upright posture and bipedal locomotion (walking on two feet). There are also marked differences in the hand, which enables the making and use of tools. |
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Check last year paper questions here : https://mycbseguide.com/cbse-question-papers.html
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Reductionism is deriving the properties of a bigger, more complex, system from the properties and interactions of its constituent simpler parts.
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Physical geography includes the study of lithosphere (landforms, drainage, relief and physiography), atmosphere (its composition,structure, elements and controls of weather and climate; temperature, pressure, winds,precipitation, climatic types, etc.),hydrosphere(oceans, seas, lakes and associated features with water realm) and biosphere ( life forms including human being and macro-organism and their sustaining mechanism, viz. food chain, ecological parameters and ecological balance).
The study of physical geography is emerging as a discipline of evaluating and managing natural resources. In order to achieve this objective, it is essential to understand the intricate relationship between physical environment and human beings. Physical environment provides resources, and human beings utilise these resources and ensure their economic and cultural development. Accelerated pace of resource utilisation with the help of modern technology has created ecological imbalance in the world. Hence, a better understanding of physical environment is absolutely essential for sustainable development.
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Akash Tomar 6 years, 5 months ago
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