Light emitting diodes work by creating an electrical circuit where electrons fallacross a “band gap" (i.e. they go from a high energy state to a low energystate). The larger the gap, the more energy they emit when they fall. Thisenergy is emitted as a photon (i.e. a particle of light). The color of lightgenerated by the LED is directly related to the size of the band gap. A largeenergy change results in blue light and small energy changes results in redlight.Because LEDS made of pure elements can only emit light that is too high ortoo low in energy for us to see, mixtures of elements must be used to create aband gap that results in visible light. The table below summarizes thecomposition and properties of three different elemental combinations used inLEDS.Table 1: Composition and Properties of LEDSElement 1Element 2Size of Band GapLED ColorGalliumNitrogenLargeBlueGalliumPhosphorousMediumGreenGalliumArsenicSmallRed Question 3Based on the figure above, what is the relationship between the ionizationenergy of Element 2 and the size of the band gap? Explain why this might be.Be sure to use the coulombic attraction between electrons and the nucleus inyour explanation.EditViewInsertFormat ToolsTable12pt vParagraph vBIUAO words</> ?::::

Introduction Band Gap or Band energy refers to the energy difference between the top of the valence…

Answered: Based on the figure above, what is the…

Biomedical Instrumentation Systems

1st Edition

ISBN:9781133478294

Author:Chatterjee

Publisher:Chatterjee

Chapter6: Biomedical Electrodes, Sensors, And Transducers

Section: Chapter Questions

Problem 9P

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Which of the following types of photons (packets of pure electromagnetic energy) have the highest energy level? visible light infrared microwaves ultra-violet
within the electromagnetic spectrum visible light provides the energy for photosynthesis and has a
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Which of the following statements is true? 1) The shortest wavelength of light is the ultraviolet ray, which is the highest in energy. 2) The longest wavelength of light is the ultraviolet ray, which is the highest in energy 3) The shortest wavelength of light is the visible light, which is the highest in energy 4 ) The shortest wavelength of light is the infrared ray, which is the highest in energy. 5) The longest wavelength of light is the infrared raywhich is the highest in energy .
Assume that you have an “X” solution that you do not know its concentration. But you have other X solutions with known concentrations and you know X solution absorbs maximum light at 575 nm. To calculate the unknown solution concentration, you have done some spectrophotometric measurements and obtained data given below. Prepare a standard curve by using the absorbance of known concentrations (Hint: you can learn how to prepare a standard curve by using Excell from youtube). Calculate the concentration of unknown.
Why do green light waves have less energy than blue light waves?
At the beginning of the light reaction, light excites electrons. Explain.
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Exercise C: Spectrophotometry Watch this video to learn how a spectrophotometer works. For additional information, you can read about using a spectrophotometer in your textbook’s “BioSkills 8: Using Spectrophotometry”. A spectrophotometer was used to determine the absorbance of 2 pigments between 400 nm and 710 nm, the range of wavelengths that is associated with visible light. The table below contains the absorbance values for each pigment (“Pigment 1” and “Pigment 2”) at wavelengths separated by approximately 10 nm. Wavelength Pigment 1 Pigment 2 400 0.097 0.117 410 0.088 0.127 420 0.099 0.143 430 0.113 0.158 440 0.129 0.181 450 0.158 0.184 460 0.145 0.171 470 0.085 0.164 480 0.041 0.143 490 0.024 0.089 500 0.022 0.048 510 0.019 0.023 520 0.018 0.014 530 0.020 0.010 540 0.019 0.008 550 0.020 0.008 560 0.022 0.009 570 0.023 0.008…
What color does an object appear if it absorbs light at both 420-500 nm and at 620-700 nm? a. Red b. Black c. Purple d. Green e. Deep blue

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