lecnotes04

# lecnotes04 - MIT OpenCourseWare http:/ocw.mit.edu 5.111...

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MIT OpenCourseWare http://ocw.mit.edu 5.111 Principles of Chemical Science Fall 2008 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .

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_______________________________________________________________________________ ________________________________________________________________________________ 5.111 Lecture Summary #4 Reading for today: Section 1.5 (1.3 in 3 rd ed ), Section 1.6 (1.4 in 3 rd ed ) Read for Lecture #5: Section 1.3 (1.6 in 3 rd ed ) – Atomic Spectra, Section 1.7 up to equation 9b (1.5 up to eq. 8b in 3 rd ed ) – Wavefunctions and Energy Levels, Section 1.8 (1.7 in 3 rd ed ) – The Principle Quantum Number Topics: I. Light as a particle A) the photoelectric effect B) photon momentum II. Matter as a wave III. The Schrödinger equation I. LIGHT AS A PARTICLE A) The Photoelectric Effect (continued from Lecture #3) The energy of an incoming photon (E i ) must be equal to or greater than the workfunction ( ) of the metal in order to eject an electron. e- __________ ejected e- __________ ejected e- __________ ejected Three photons, each with an energy equal to /2 will NOT eject an electron! 1
The # of electrons ejected from the surface of a metal is proportional to the ______________ of photons absorbed by the metal (assuming E i ), and not the energy of the photons. Thus, the intensity (I) of the light (energy/sec) is proportional to the # of photons ejected/sec. High intensity means more __________________ and NOT more _________________. Unit of intensity (I) : W = ___________ Terminology tips to help solve problems involving photons and electrons: photons: also called light, electromagnetic radiation, etc. o

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## This note was uploaded on 11/27/2011 for the course CHEMICAL E 20.410j taught by Professor Rogerd.kamm during the Spring '03 term at MIT.

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lecnotes04 - MIT OpenCourseWare http:/ocw.mit.edu 5.111...

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