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# Waves classic to quantum

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### Waves classic to quantum

1. 1. `
2. 2. Today’s Topics • Quantum Theory • Wave Properties • The Electromagnetic Spectrum
3. 3. History of Quantum Theory • Classic Mechanics: – Molecules behave like balls • Pro – Explained things like pressure • Con – Did not explain molecule well • Quantum Theory – Maxwell Planck (1858 – 1947) • Discovered that atoms & molecules emit / absorb energy only in certain discrete quantities called quanta.
4. 4. Waves
5. 5. Not those waves, these waves Wave – a vibrating disturbance by which energy is transferred 2 Types of Waves: 1)Longitudinal – particle displacement is parallel to direction of wave propagation 2)Transverse – particle displacement is perpendicular to the direction of wave propagation.
6. 6. Parts of the Wave Wavelength (λ) – Distance between identical points on successive waves. Frequency(ν) – The number of waves that pass through a particular point in 1 second. Amplitude – Vertical distance from the midline of a wave to the peak or trough.
7. 7. REMEMBER THIS IMPORTANT FORMULA Wave velocity = Wavelength x Frequency u = λν Speed = distance/time (m/s) Wavelength = distance between waves (nm) Frequency = waves/time (s-1 , 1/s, Hz)
8. 8. James Maxwell 1873 – Proposed that light is an electromagnetic wave. Electromagnetic wave – Has an electric field component and a magnetic field component with the same wavelength and frequency, but travels in perpendicular planes. Electromagnetic Radiation – emission and transmission of energy in the form of electromagnetic waves. Electromagnetic waves travel at 3.00x108 m/s in a vacuum. The speed of light (c) = 3.00x108 m/s
9. 9. ELECTROMAGNETIC SPECTRUM Shows difference in wavelength and frequency for different types of electromagnetic radiation.