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Published byRoger Gervase Taylor Modified over 9 years ago
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Electromagnetic Spectrum Chemistry 6(B)
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Lesson Objectives Explore the electromagnetic spectrum Understand the mathematical relationships between energy, frequency, and wavelength of light Electromagnetic Spectrum
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Electromagnetic spectrum includes a wide range of radiation – Electromagnetic radiation – form of energy that displays characteristics of a wave as it moves through space Electromagnetic Spectrum of Radiation
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Visible light is type of electromagnetic radiation – Comprises a small portion of the electromagnetic spectrum Ranges from 400–700 nm Visible Light User:Tatoute [GFDL ]
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Waves are characterized by – Wavelength (λ) – distance between two successive peaks Units of meters (m) – Frequency ( f ) – number of wave cycles completed during a unit of time Units of hertz (Hz) Wave diagram Wave Nature of Light
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Wavelength and frequency are inversely proportional Mathematical association between wavelength and frequency expressed in relation to speed of light (c) c = 3.00 x 10 8 m/s Wave Nature of Light Wave diagram
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Wave Calculation 1.Write unknown and givens λ= 5.50 x 10 -6 m c = 3.00 x 10 8 m/s f = ? 2.Identify the formula and rearrange, if needed 3.Convert units and find intermediates, if needed 4.Plug in and solve 5.Make sure the answer is reasonable Ex) What is the frequency of a photon whose wavelength is 5.50 x 10 -6 m?
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Energy of waves is – Directly proportional to frequency – Inversely proportional to wavelength Energy of Waves Energy
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Lesson Objectives Explore the electromagnetic spectrum Understand the mathematical relationships between energy, frequency, and wavelength of light Electromagnetic Spectrum
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