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lecture13 - BIEN 130 Bioinstrumentation L13 Hyle Park...

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BIEN 130: Bioinstrumentation L13 May 12, 2009 Hyle Park
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Questions Go over homework
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Digital scale Why no shot noise? Why no intensity-based noise analysis needed here?
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X-ray machine Light is a form of electromagnetic radiation (wave) Can also be thought of as photons (particle) Dual nature of light Sometimes acts like a wave, sometimes like a particle
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X-ray machine Light scattering (wave phenomenon) Assuming no other interaction, the longer the wavelength, the less scattering in a given material (Rayleigh scattering) This is reason the sky is blue and why sunsets are redder
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X-ray machine As far as human tissue goes, visible light scatters very quickly Blue has short wavelength (for visible light) Red has long wavelength (for visible light) Neither penetrates through tissue very well Which one goes further through tissue?
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X-ray machine
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