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Lecture-5 - Lecture 5 Light and Matter What is light How...

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10/14/11 Physics 20 Lecture 7 1 Lecture # 5: Light and Matter What is light ? • How light and matter interact ? • Nature of light • The Electromagnetic spectrum • Structure and properties of Matter • The spectra • How does light tell us about the composition and temperature of objects ? • Doppler shift
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10/14/11 Physics 20 Lecture 7 2 Definition: Wavelength
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10/14/11 Physics 20 Lecture 7 3 The color of light depends on the wavelength of the light: Refraction of light by prism
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10/14/11 Physics 20 Lecture 7 4 EM Spectrum Radio Infrared (IR) Visible (400-700 nm) Ultraviolet (UV) X-ray Gamma Ray R ed O range Y ellow G reen B lue I ndigo V iolet Roy G Biv nm = nanometer (10 -9 m)
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10/14/11 Physics 20 Lecture 7 5 Relation between Wavelength and Frequency Longer wavelength means lower frequency Shorter wavelength means higher frequency wavelength and frequency are inversely proportional
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10/14/11 Physics 20 Lecture 7 6 Light as Electromagnetic (EM) Waves • Wavelength, λ in nanometers (nm), (10 -9 m) • Frequency, f , in Hertz (Hz), (vibrations per second) • Speed of Propagation, c , (km/s) (3 x 10 5 km/s or 3 x 10 8 m/s) f = c λ λ = c f c = f λ c E, B λ wavelength x frequency = velocity
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10/14/11 Physics 20 Lecture 7 7 Nature of Light Light has dual nature: Wave and Particle Light in the wave form is called electromagnetic wave Light in the particle form consists of particles called “photons”
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10/14/11 Physics 20 Lecture 7 8 The Wave Nature of Electromagnetic Radiation Charged Particles & Electric Fields
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10/14/11 Physics 20 Lecture 7 9 Magnetic Fields Waves of both Electric Fields and Magnetic Fields propagate together.
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