Electromagnetic Spectrum

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Presentation transcript:

Electromagnetic Spectrum Chemistry I

Ground vs. Excited State Ground State – electrons are in positions of lowest energy possible (normal) Excited State – electron is in a temporary position of higher energy than ground state Very unstable; the electron quickly returns to the ground state This releases energy, in the form of light

Emission of Energy The amount of energy released when returning from excited state to ground state is different for each element Some of the energy released has wavelengths within the visible light range

Nature of Light Light: electromagnetic energy (“radiation”) Electromagnetic Spectrum: arrangement of wavelengths & frequencies for electromagnetic radiation Wavelength (λ): distance between 2 points on adjacent waves Measured in nm or m Frequency (Ѵ): # of waves that pass through a point in time Measured in Hertz (Hz) or s-1 Equation: C = λѴ C = speed of light (3.00 x 108 m/s) λ = wavelength in m Ѵ = frequency in s-1

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