CH301 CH 1 lecture slides Atkins and Jones fall06

# CH301 CH 1 lecture slides Atkins and Jones fall06 - CHAPTER...

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1 CHAPTER 1 Atoms: The Quantum World

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2 Fundamental Particles Particle Mass (amu ) Charge Electron (e - ) 0.00054858 -1 Proton (p,p + ) 1.0073 +1 Neutron(n,n 0 ) 1.0087 0 Three fundamental particles make up atoms. The following table lists these particles together with their masses and their charges.
3 The Characteristics of The Characteristics of Electromagnetic Radiation Electromagnetic Radiation Electromagnetic radiation = radiant energy 1. electromagnetic radiation is described in terms of waves 2. waves are represented by frequency and wavelength 3. how fast a wave travels is expressed in cycles per second 4. the shorter the wavelength, the greater the frequencies 5. short wavelengths (higher frequencies) are more energetic Section 1.1

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4 The Characteristics of The Characteristics of Electromagnetic Radiation Electromagnetic Radiation The wavelength wavelength of electromagnetic radiation has the symbol λ (Greek letter lambda). Wavelength is the distance from the top (crest) of one wave to the top of the next wave. Measured in units of distance such as m,cm, nm and Å . 1 Å  = 1 x 10 -10 m = 1 x 10 -8 cm = 1 x 10 -1 nm
5 The Characteristics of The Characteristics of Electromagnetic Radiation Electromagnetic Radiation The frequency frequency of electromagnetic radiation has the symbol υ (Greek letter nu). Frequency is the number of crests or troughs (cycles) that pass a given point per second. Measured in units of 1/time = s -1 Hertz = Hz = 1 s -1

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6 The Characteristics of The Characteristics of Electromagnetic Radiation Electromagnetic Radiation the amplitude is the height of the wave the intensity is the brightness of light in classical physics terms.
7 Figure 1.1 Electromagnetic wave

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8 Electromagnetic Radiation The relationship between wavelength and frequency for any wave is velocity = λ υ. For electromagnetic radiation the velocity is 3.00 x 10 8 m/s and has the symbol c . Thus c = λ υ for electromagnetic radiation . All electromagnetic waves travel at the speed of light.
9 Figure 1.2

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10 Longer wavelengths (lower energy) have lower frequencies (the time it takes for one wavelength to pass the pole.) Shorter wavelengths (higher energy) have higher frequencies.