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Chapter 4 The Electromagnetic Spectrum Part 1

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Demonstration Gas spectral tubes: NeonArgon

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Visible Light Part of the Electromagnetic Spectrum

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All types of electromagnetic energy move in waves. Light and sound move by waves. Light moves at 3 x 10 8 m/s Sound moves at 340 m/s 1 mile = 1609 m

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All types of electromagnetic energy move in waves. Light moves at 3 x 10 8 m/s Sound moves at 340 m/s Is sound a form of electromagnetic radiation?

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Electromagnetic Waves Properties of waves include speed, frequency and wavelength All electromagnetic waves including light travel at a speed of 3 x 10 8 m/s.

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) Wavelength ( ) Measured in units of length: m, nm, A º

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) Frequency ( ) Measured in cycles/second = hertz (Hz)

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Visible Light

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For all waves = cFor all waves = c c = the speed of light = 3.00 x 10 8 m/sc = the speed of light = 3.00 x 10 8 m/s Electromagnetic Radiation

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A photon of red light has a wavelength of 665 nm. What is the frequency of this light?

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665 nm = 665 x m

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A photon of red light has a wavelength of 665 nm. What is the frequency of this light? 665 nm = 665 x m c =

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A photon of red light has a wavelength of 665 nm. What is the frequency of this light? 665 nm = 665 x m c = = c ÷ = 3.00 x 10 8 m/s ÷ 665 x m

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A photon of red light has a wavelength of 665 nm. What is the frequency of this light? 665 nm = 665 x m c = = c ÷ = 3.00 x 10 8 m/s ÷ 665 x m = x /s or Hz

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A photon of red light has a wavelength of 665 nm. What is the frequency of this light? 665 nm = 665 x m c = = c ÷ = 3.00 x 10 8 m/s ÷ 665 x m = x /s or Hz = 4.51 x /s or Hz

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An x-ray has a frequency of 7.25 x Hz. What is the wavelength?

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7.25 x Hz = 7.25 x /s

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An x-ray has a frequency of 7.25 x Hz. What is the wavelength? 7.25 x Hz = 7.25 x /s c =

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An x-ray has a frequency of 7.25 x Hz. What is the wavelength? 7.25 x Hz = 7.25 x /s c = = c ÷ = 3.00 x 10 8 m/s ÷ 7.25 x /s

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An x-ray has a frequency of 7.25 x Hz. What is the wavelength? 7.25 x Hz = 7.25 x /s c = = c ÷ = 3.00 x 10 8 m/s ÷ 7.25 x /s = x m

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An x-ray has a frequency of 7.25 x Hz. What is the wavelength? 7.25 x Hz = 7.25 x /s c = = c ÷ = 3.00 x 10 8 m/s ÷ 7.25 x /s = x m = 4.14 x m

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Energy of Waves

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For all waves: E = hFor all waves: E = h h = 6.63 x J s or J/Hz Energy of Electromagnetic Radiation

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A photon of red light has a wavelength of 665 nm. What is the energy of this light?

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665 nm = 665 x m c = = c ÷ = 3.00 x 10 8 m/s ÷ 665 x m = x /s or Hz = 4.51 x /s or Hz

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A photon of red light has a wavelength of 665 nm. What is the energy of this light? 665 nm = 665 x m c = = c ÷ = 3.00 x 10 8 m/s ÷ 665 x m = x /s or Hz = 4.51 x /s or Hz E = h = (6.63 x J s)(4.51 x /s)

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A photon of red light has a wavelength of 665 nm. What is the energy of this light? 665 nm = 665 x m c = = c ÷ = 3.00 x 10 8 m/s ÷ 665 x m = x /s or Hz = 4.51 x /s or Hz E = h = (6.63 x J s)(4.51 x /s) E = x J

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A photon of red light has a wavelength of 665 nm. What is the energy of this light? 665 nm = 665 x m c = = c ÷ = 3.00 x 10 8 m/s ÷ 665 x m = x /s or Hz = 4.51 x /s or Hz E = h = (6.63 x J s)(4.51 x /s) E = x J = 2.99 x J

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An x-ray has a frequency of 7.25 x Hz. What is its energy?

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An x-ray has a frequency of 7.25 x Hz. What is it’s energy? E = h = (6.63 x J/Hz)(7.25 x Hz)

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An x-ray has a frequency of 7.25 x Hz. What is it’s energy? E = h = (6.63 x J/Hz)(7.25 x Hz) E = x J

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An x-ray has a frequency of 7.25 x Hz. What is it’s energy? E = h = (6.63 x J/Hz)(7.25 x Hz) E = x J E = 4.81 x J

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wavelength, frequency and energy = 665 x m = 4.51 x Hz E = 2.99 x J = 4.14 x m = 7.25 x Hz E = 4.81 x J Red Light X-ray

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Wavelength, frequency and energy Wavelength and frequency have an indirect relationship. Energy and frequency have a direct relationship. Electromagnetic radiation with a shorter wavelength will have a higher frequency and higher energy. Electromagnetic radiation with a longer wavelength will have a lower frequency and lower energy.

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Homework Chapter 4: Worksheet 2 (due in two days)

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