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Lecture 15_100108 - • In the early 20th century several...

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Waves of Light Electromagnetic Radiation Not all radiation is equal Prisms break sunlight into spectrum of colors Colors identified by numerical value (wavelength)
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Electromagnetic Radiation
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Electromagnetic Radiation Wave traveling through space Electric field Magnetic field
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Electromagnetic Radiation Wavelength (Greek lambda, λ ) distance between corresponding points on adjacent waves Expressed in units of length: nanometers (nm) 6
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Wave Nature of Light
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Relation between υ and λ As υ (frequency) increases , λ (wavelength) decreases As υ decreases , λ increases Frequency = υ = c/ λ c= speed of light 3.00 x 10 8 meters/second or 186,000 miles/second λ and υ are inversely related
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Fig. 2.6 Electromagnetic Spectrum
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Electromagnetic Radiation
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Electromagnetic Radiation The red light in a laser pointer comes from a diode laser that has a wavelength of about 630 nm. What is the frequency of the light? c = 3.00 x 10 8 m/s –1
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Light as a Particle
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Unformatted text preview: • In the early 20th century, several discoveries led to a particle model of light. • Photons: “particles” of light • Energy of a photon: E = h ν • h = “Planck’s Constant”= 6.626 x 10 –34 J s Planck’s Equation Energy, E = h υ = hc / λ – E is the energy of a single photon – c = 3.00 x 10 8 m/sec – h, Planck’s constant = 6.63 x 10-34 joule sec – Joule is a unit of energy • Energy is directly proportional to υ (frequency) and inversely proportional to λ (wavelength) • As ↓ , ↑ , E ↑ • As ↑ , ↓ , E ↓ Electromagnetic Spectrum Energy (J) The Energy and Frequency of Quanta Radiation λ ν E Photon E mol (m) (s-1 ) (J) (kJ/mol) Radio Wave 10 3.0x 10 7 2.0 x 10-26 1.2x10-5-22 30-3 21 Photon Energy • A laser emits red light with wavelength of 630 nm (1 nm = 10 –9 m) • What is the energy of a photon at this Wavelength?...
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Lecture 15_100108 - • In the early 20th century several...

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