chapter05_light

chapter05_light - Waves Water waves Sound waves Waves in a...

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Unformatted text preview: Waves Water waves Sound waves Waves in a string Transmission of energy from 1 point to another, without motion of the material Wave Properties What are some possible units for wavelength ( )? General Wave Properties Frequency Color frequency = 1 / period f = 1/T Wave Velocity = Wavelength x Frequency V = x f So for EM waves, c = x f Example: What is the wavelength of radio waves trasmitted at 100 MHz? What exactly is Light? Wave? Particles? Newton: Particles Huygens: Waves Today: Both! Macroscopic Situations : wave Microscopic Situations : particle Wave Nature of Light Diffraction: Bending of light (or other EM waves) around an obstacle More noticeable when obstacle size ~ Governs the best possible resolution of a telescope! Interference Superposition Principle Constructive Interference Waves add Destructive Interference Waves cancel Electromagnetic Spectrum Electromagnetism Two basic kinds of charge: +,- Electrons ( - charge) Protons ( + charge) Electrostatic Forces: Like charges repel! Unlike charges attract! Moving charge produces a magnetic field! Moving magnet produces (induces) motion of charge! So what are electromagnetic waves? Patterns of Electric and Magnetic Fields oscillating perpendicular to each other! Oscillating Electric field produces a magnetic field! Oscillating Magnetic field produces an electric field! Generate each other, so no need for a medium! Other different kinds of Electromagnetic Waves 540 540 1600 KHz 1600 KHz AM radio AM radio 88 88 108 MHz 108 MHz FM radio FM radio Microwave ovens! Microwave ovens! Microwaves Microwaves Night vision cameras Night vision cameras IR IR Sunburns caused if too Sunburns caused if too much UV! much UV! UV UV Used by Dentists, Used by Dentists, Radiologists Radiologists X-rays X-rays Emitted in radioactive Emitted in radioactive decays decays -rays-rays Examples/ Examples/ Applications Applications Type Type Speed of all electromagnetic...
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chapter05_light - Waves Water waves Sound waves Waves in a...

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