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# CP5.3--electrons

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### CP5.3--electrons

1. 1. Section 3:Physics and the Quantum Mechanical Model
2. 2.  Draw and identify the features of a wave;  Describe the relationship among the frequency, wavelength, and energy of light;  Identify the general ranges of electromagnetic radiation and their relative wavelengths and frequencies;  Explain the source of atomic emission spectra;  Explain how the frequencies of emitted light are related to changes in electron energy
3. 3.  Light made of electromagnetic waves ◦ Considered to be quanta of energy called photons ◦ Has properties of particles and waves Wavelength (λ) :distance between crests Amplitude
4. 4.  Frequency (ν): number of wave cycles to pass a given point per unit of time ◦ SI unit is Hertz (Hz), or s-1  Two are related by the formula:  Since c is constant, λ and ν are inversely proportional  If one is big, the other is small speed of light 3 x 108m/s
5. 5.  If you know either λ or ν, can solve for other  Example: What is the wavelength of a wave with frequency equal to 5.10 x 1014 Hz? c   c Rearrange
6. 6.  Energy of light is related to frequency ◦ Higher the frequency, more energy  Visible light is small slice in the middle of spectrum ◦ Red is lowest ν(longest λ) that the human eye “sees”
7. 7.  Ground state: electrons in lowest possible energy level  Excited state: atoms absorb energy and electrons move to higher energy levels ◦ Once energy source is removed, electrons drop back down to ground state ◦ Emit quanta of energy in the form of… light (sometimes visible)
8. 8.  Atomic emission spectrum: pattern of discreet lines given off by electrons dropping to ground state ◦ Energy levels are quantized ◦ Each line represents a frequency (energy) that is directly proportional to the energy lost by the electron ◦ No two elements have exactly the same spectrum
9. 9.  Each drop an electron makes relates to a specific frequency of energy  Not all is in visible range, but always at discreet frequencies (not continuous)
10. 10.  Draw and identify the features of a wave?  Describe the relationship among the frequency, wavelength, and energy of light?  Identify the general ranges of electromagnetic radiation and their relative wavelengths and frequencies?  Explain the source of atomic emission spectra?  Explain how the frequencies of emitted light are related to changes in electron energy?
11. 11.  Page 140 #14, 15  Page 146 #16, 17, 21