1. 2011 년 11 월 25 일 제 10 장 http://socas.inje.ac.kr

2.  The Quantum Hypothesis  The Photoelectric Effect and Photons  Atomic Spectra  The Bohr Model of the Atom  Quantum Mechanics  Atomic Structure  X-Ray Spectra  Lasers

3.  Fluorescent light  Plasma TV

4.  End of 19 th century ◦ Newtonian mechanics ◦ Electromagnetism by Maxwell ◦ Everything is resolved  New experiments ◦ Blackbody radiation ◦ Photoelectric effect ◦ Atomic spectra

5.  Absorb all radiation and perfect emitter, as temperature increase ◦ More energy at each wavelength ◦ Smaller Peak energy wavelength

7.  Discovered by Heinrich Hertz

10.  Energies of each color

11.  Light detector  Photocopy  Laser printer

12.  Photocopying process

13.  Light bulb creates continuous spectrum

15.  Structure Atom is not believed  Rutherford’s experiment

16.  Atom forms a miniature of solar system  Electron orbits are quantized  Electrons may jump from one orbit to another

20.  1925 Davisson and Germer experiment

22.  Radius of hydrogen atom

25.  Energy levels  Quantum numbers

27.  n=3 -> n=2

28.  Two electrons cannot occupy precisely the same quantum state at the same time ElementAtomic Number n=1n=2n=3 Hydrogen1100 Helium2200 Lithium3210 Carbon6240 Oxygen8260 Neon10280 Sodium11281

30.  Light Amplification by Stimulated Emission of Radiation