MODERN PHYSICS CLASS 12

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CBSE Class 12 Physics Modern Physics Exam Notes. Please refer to the examination notes which you have the right to use for preparing and also revising for exams. These notes will certainly assist you to revise the concepts quickly and also get excellent marks.

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Bohr’s Model for atom Bohr’s theory is a mix of timeless and quantum method. It clears the draw backs of Rutherford’s model according to which electron must loose power while revolving about nucleus and also lastly need to fall into nucleus. When electron goes from orlittle bit to another it can orlittle bit or radiate electromagnetic radiation. Postulates (i) electron moves in circular course about nucleus under the influence of electrostatic attractivity between electron and nucleus. (ii) electron have the right to relocate just in schosen orbits in which electron can have angular momentum integer multiply of .h/2π i.e., mvr = nh/2π wbelow h is plank’s consistent and also n is shell no.

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Interpretation of hydrogen spectrum

The electron in the hydrogen atom resides in the initially orlittle. When power is offered, the electron moves to higher power shells depending upon the amount of energy absorbed. When this electron retransforms to any of the lower power level, it emits power. Lyman series is acquired when the electron retransforms to the lowest energy state while Balmer series is obtained once the electron retransforms to second energy shell. Similarly, Pashcen, Brackett and also Pfund series are obtained when electron retransforms to the third, fourth and fifth energy shell from higher power shells respectively.

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