light of wavelength 660nm has wavetrains 20lamda long,what is coherence length and coherence time?

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15 Jan 2024

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The coherence length of an ordinary white light source canbeincreased if we place a color filter in front of the source,sothat the light that passes through the filter issomewhatmonochromatic. The minimum wavelength of the emerging lightis636 nm. What is the maximum wavelength inorder for the coherencelength to be 0.09500 mm?

1) How are interference experiments evidence for the wave theory oflight?
2) Is coherence important in interference? In diffraction? Inrefraction? In reflection? 3) In what way are interference anddiffraction similar? Different?

Please exlain all answers in detail and prove sketches.

A "pulse oximeter" operates by using light and a photocelltomeasure oxygen saturation in arterial blood. The transmissionoflight energy as it passes through a solution oflight-absorbingmolecules is described by the Beer-Lambert law,given below, whichgives the decrease in intensity I in terms of thedistance L thelight has traveled through a fluid with aconcentration C of thelight-absorbing molecule.

I =I₀10^-ÎµCLorlog₁₀(I / I₀)=-ÎµCL

The quantity Îµ is called the extinctioncoefficient, andits value depends on the frequency of the light.(It has units ofm²/mol.) Assume that the extinctioncoefficient for 660nm light passing through a solution ofoxygenated hemoglobin isidentical to the coefficient for 940 nmlight passing throughdeoxygenated hemoglobin. Assume also that 940nm light has zeroabsorption (Îµ = 0) inoxygenated hemoglobin and 660 nmlight has zero absorption indeoxygenated hemoglobin. If 31% oftheenergy of the red source and 78% of theinfrared energy istransmitted through the blood, determine thefraction of hemoglobinthat is oxygenated.

Your response is within 10% of the correctvalue. This may be due toroundoff error, or you could have amistake in your calculation.Carry out all intermediate results toat least four-digit accuracyto minimize roundofferror.%

I was usingthis as a guide but I get the same answer anditswrong:/answers-mar-09/physics/urgent-need-help-please-a-pulse-oximeter-operates-by-using-light-and-a-photocell-to_514319.aspx

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light of wavelength 660nm has wavetrains 20lamda long,what is coherence length and coherence time?

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