CH301 CH 1 lecture slides Atkins and Jones fall06

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

Info iconThis preview shows pages 1–15. Sign up to view the full content.

View Full Document Right Arrow Icon
1 CHAPTER 1 Atoms: The Quantum World
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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.
Background image of page 2
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
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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
Background image of page 4
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
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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.
Background image of page 6
7 Figure 1.1 Electromagnetic wave
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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.
Background image of page 8
9 Figure 1.2
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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.
Background image of page 10
11 Electromagnetic Radiation the continuous spectrum of electromagnetic radiation.
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
12 longer λ = low ν = lower energy shorter λ = higher ν = higher energy
Background image of page 12
13 Electromagnetic Radiation Example: What is the frequency of green light of wavelength 5200 Å ? -10 -7 c c 1 x 10 m (5200 Å) 5.200 10 m 1 Å λν ν λ = = = 1 - 14 7 - 8 s 10 5.77 m 10 5.200 m/s 10 3.00 × = × × =
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon