CHEM1011 Lecture Notes - Lecture 4: Electromagnetic Radiation, Electromagnetic Spectrum, Bohr Model
24 May 2018
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Lecture 4: Electromagnetic radiation/ electronic structure
EM Spectrum
Waves
Wavelegth, λ, lada
- The distance between two adjacent identical points
of the wave.
Feuey, ν, u
- The number of wave crests passing a given point
per unit time.
Light
- All light waves travel at exactly the same speed (in a vacuum) – the speed of light, C, is a
constant.
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2
- Wavelength and frequency are related to the speed of light.
Electromagnetic radiation
- All radiation may have the same speed, but the energy can vary
- The higher the frequency, the more rapidly the wave is oscillating and the higher the
energy
- To work out the energy of a photon (particles that transmit light):
Colour
All colours travel at the same speed in a vacuum. However in a prism, some colours travel
slower than others.
Atomic spectra
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Document Summary
The distance between two adjacent identical points of the wave. The number of wave crests passing a given point per unit time. All light waves travel at exactly the same speed (in a vacuum) the speed of light, c, is a constant. Wavelength and frequency are related to the speed of light. All radiation may have the same speed, but the energy can vary. The higher the frequency, the more rapidly the wave is oscillating and the higher the energy. To work out the energy of a photon (particles that transmit light): All colours travel at the same speed in a vacuum. However in a prism, some colours travel slower than others. When an atom is supplied with energy (e. g. heat, electric current), it emits electromagnetic radiation of a relatively few, fixed frequencies that are characteristic of that element- this is the atomic emission spectrum. Light emitted from a hydrogen lap has only a few lines.
