Lecture_14 - Today's Lecture Quantum Mechanics and Atomic...

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1 Quantum Mechanics and Atomic Theory Today’s Lecture 12.1 Electromagnetic Radiation 12.2 The Nature of Matter 1 Electromagnetic Radiation ± our understanding of the electronic structure of atoms will begin by looking at the interactions of electromagnetic radiation (emr) and matter ± electromagnetic radiation is a form of energy transmission in which electric an magnetic fields are propagated as waves through empty space or through a medium such as glass ± according to a theory proposed by James Maxwell emr ha 2 Fig. 12.1 Maxwell, has electric and magnetic fields that oscillate in planes mutually perpendicular to each other and to the direction of propagation through space
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2 The Nature of Waves ± a wave is a disturbance that transmits energy through space or a material medium 1 second ± waves have three characteristics: λ 1 ν 1 = 4 cycles/second = 4 hertz λ 2 ± wavelength (symbolized by lambda, λ )i st h ed i s t a n c e between 2 consecutive peaks or troughs in a wave ± frequency (symbolized by nu, ν ) is the number of waves (cycles) 3 ν 2 = 8 cycles/second = 8 hertz λ 3 ν 3 = 16 cycles/second = 16 hertz per second that pass a given point in space ± speed is the product of the length of the wave ( λ )andi t s frequency( ν ) Fig. 12.2 ± a distinctive feature of emr is its constant speed of 2.99792458 x 10 8 ms -1 in a vacuum, often referred to as the speed of light (symbolized by c) the speed of light (symbolized by c) ± where λ is expressed in metres and ν is expressed in s -1 c = λν 10 -12 10 -10 10 -8 4 x 10 -7 Wavelength in meters 7 x 10 -7 10 -4 10 -2 1 10 2 10 4 4 Gamma rays X rays Ultraviolet Infrared Microwaves Radio waves FM Shortwave AM 4 x 10
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Lecture_14 - Today's Lecture Quantum Mechanics and Atomic...

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