Chapter 5 Part One

Chapter 5 Part One - Chapter 5 Light Radiation: Light,...

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Unformatted text preview: Chapter 5 Light Radiation: Light, Radio, Infra-red, Ultraviolet, X-rays, Gamma rays Electromagnetic Radiation Waves of energy transmitted across space What is a wave? 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 c = 3 x 10 8 m/s Speed of light Ultimate speed limit! 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! 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!...
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Chapter 5 Part One - Chapter 5 Light Radiation: Light,...

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