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Connection of Atom and LightLine spectrum of hydrogen atom

Sojeong Park Ilseok Jeong 1OutlineIntroductionInvestigation of the atomRutherford -particle scattering Line spectrumBohrs atomic modelConclusion

2Introduction

3Investigation of the atom

Albert Einstein1879 - 1955Ludwig Eduard Boltzmann1844 - 1906

Published paper which undeniably proclaimed the reality of the atom4Brownian motion

Einstein saw the Brownian motion was all about atomsPollen grains are dancing furiously almost as though they were alive 5Rutherford -particle scattering experiment

Ernest Rutherford1871 - 1937

The Rutherford atom is almost entirely empty space The nucleus is 10,000 times smaller than the atom

6Contradiction of Rutherford atomic model

Electrons orbit around the nucleus radiate light and lose their energyRutherford atom contradicted the law of science7

Line spectrum

The line in the spectrum correspond to the energy difference between the two statesThe spectra tells us something about in a structure of the atom

1885 Johann Balmer Line spectrum of hydrogen atoms1913 Niels Bohr Theory of atomic spectra

Niels Bohr1885 - 1962Johann Balmer1825 - 18988Purpose of the researchExplanation of the hydrogen line spectrum Justification of Rutherford atomic modelLimitationImpossible to describe the line spectrumInstability of the atom Bohrs atomic model

9An electron undergoes a circular motion around the nucleus under the coulomb force

Bohrs atomic model

Centripetal force = Coulomb force

10Bohrs assumptions1. Quantization conditionThe angular momentum of the electron is an integer multiple of the reduced Planck constant

Bohrs atomic model

Due to The angular momentum is quantized

11Bohrs assumptions1. Quantization condition

Bohrs atomic model

The radius and the energy are also quantized

12Bohrs assumptions 2. Quantum jump

Bohrs atomic model

13Copenhagen interpretationIntergenerational conflict to quantum mechanics

Albert Einstein1879 - 1955Erwin Schrdinger1887 - 1961Werner Heisenberg1901 - 1976Niels Bohr1885 - 1962Old generationNew generation14Copenhagen interpretationHeisenbergs uncertainty principle

we cannot measure the position (x) and the momentum (p) of a particle with absolute precision.15

Thank you for attention 16