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# lec15 - period T-time for one wave Waves v f T v = = • EM...

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A wave is a traveling disturbance that propagates energy. The medium in which the wave travels could be either a substance (fluid or solid) or a field (e.g. the electromagnetic field) A periodic wave is due to disturbances that repeat in time. The disturbance could take various forms: Elastic deformation (Wave on a stretched string) Pressure variation (Sound waves) Variation in electric and magnetic field strengths (Radio, TV waves, Light) In a transverse wave the disturbances occur perpendicular to the direction of wave propagation. (wave on a string, radio, TV waves, light) In a longitudinal wave the disturbances occur parallel to the direction of wave propagation (sound wave) Wave properties : wave speed ( v ) - speed of propagation wavelength ( λ ) - distance between adjacent crests frequency ( f ) - number of waves per second.

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Unformatted text preview: period ( T ) -time for one wave Waves v f T v = = • EM waves (waves of E and B fields) are predicted by J.C. Maxwell (during the 1850’s) and experimentally confirmed by H. Hertz (1887) • EM waves are generated by oscillating charges or periodically varying currents. • EM waves are waves of electric and magnetic fields. They do not require a medium in which to propagate in. EM waves can travel through vacuum or material substance. • Speed of EM wave in vacuum is predicated by Maxwell to be – This value agrees with the measured speed of light in vacuum. Therefore visible light is an EM wave ( wavelength between 350 and 750 nm ). • EM waves come in a wide range of wavelengths (or frequencies) Electromagnetic Waves s / m 10 3 f c 8 × = = = ε µ λ 1 Visible light AM FM Microwave...
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lec15 - period T-time for one wave Waves v f T v = = • EM...

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