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PHY132_L27 - Classical Physics II Classical Physics II...

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Classical Physics II PHY132 Lecture 27 Mi d Gl R fl ti d R f ti Mirrors and Glass: Reflection and Refraction … Lecture 27 1 04/12/2010
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Electromagnetic Spectrum F d l h Frequency and wavelength: f λ = c The visible part of the EM spectrum is only small, from 400 nm < λ < 800 nm different wavelengths are seen as different COLORS from short λ to long: i l t bl ll d violet , blue , green , yellow , orange , red larger λ (lower f ): INFRARED, followed by – MICROWAVES: 0.1 mm < λ < 1 m , – RADIOWAVES: λ > 1m: UHF VHF MW LW VLF UHF, VHF, MW, LW, VLF, … shorter λ (higher f ): – ULTRAVIOLET: 1 nm < λ < 400 nm , SOFT/HARD X RAY: 1 pm < λ < 1 nm and Lecture 27 2 SOFT/HARD X-RAY: , and – GAMMA: λ < 1 pm , where instead of wavelength one usually uses photon energy to denote the radiation 04/12/2010
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