compared to clear dry days. Why do we have Blue Sky? The blue color of the sky is due to Rayleigh scattering. As light moves through the atmosphere‚ most of the longer wavelengths pass straight through. Little of the red‚ orange and yellow light is affected by the air. However‚ much of the shorter wavelength light is absorbed by the gas molecules. The absorbed blue light is then radiated in different directions. It gets scattered all around the sky. Whichever direction you look‚ some
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Baldeo Persaud NT1310 Unit 9 Exercise 1 Light Source and Components-Definitions 1. Forward Biased LED: A bias voltage that is applied to a pn-junction in the direction that causes a large current flow; used in some semiconductor diode circuits. 2. Incoherent Light: Light in which the electric and magnetic fields of photons are completely random in orientation. Incoherent light is typically emitted from light bulbs and LEDs. 3. Laser: Acronym for light amplification by stimulated emission of radiation
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wavelength of light. Because the velocity of light in air is always greater than that through a liquid‚ the refractive index is a number greater than 1; for example‚ hexane n20D 1.3751. The superscript 20 indicates that the measurement was made at 20 oC‚ and the subscript D refers to the yellow D-line of a sodium vapor lamp‚ light with a wavelength of 589 nm. The measurement is made with a refractometer using a few drops of liquid. Compensation is made within the instrument for the fact that white
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and ‘D’ be the distance of the screen (AB) from S1 S2 . Let us consider a point P at a distance ‘x’ from the center ‘O’ (Fig.). 2 Condition for bright fringe: The point P is bright when the path difference is a whole number of multiple of wavelength λ. That is‚ (S2 P - S1 P) = n λ where n = 0‚ 1‚ 2‚ 3‚… From triangle S1QP we have (1) (S1P)2 = (S1Q)2 + (QP)2 From the triangle S2RP (S2P)2 = (S2R)2 + (PR)2 (S2P)2 - (S1P)2 = (S2R)2 + (PR)2 - (S1Q)2 - (QP)2 (S2 P + S1 P) (S2 P
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1. Horizontal Cable- The cabling between and including the telecommunications outlet and the horizontal cross-connect. 2. Backbone Cable- A cable connection between telecommunications or wiring closets‚ floor distribution terminals‚ entrance facilities‚ and equipment rooms either within or between buildings. 3. Patch Cords- Any flexible piece of cable that connects one network device to the main cable run or to a patch panel that in turn connects to the main cable run. 4. Connectors- A device attached
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of transverse waves. A longitudinal wave is a wave in which its particles vibrate parallel to their direction of propagation. Sound waves‚ earthquake waves and tsunami waves are examples of longitudinal waves. Some terms to be considered are: Wavelength: the distance between two successive identical points Frequency: number of waves that pass through a fixed point in a second Amplitude: maximum displacement that particles can move to and from their equilibrium position Crest: Highest points
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1 Lab Assignment #5 Write-Up 2 General Info: Name: Date: Purpose: Of Exp #5: In this experiment we will learn about the spectroscope and how it works. To learn the concept of quantitative measurements‚ to construct a spectroscope and‚ to use it for taking quantitative measurements. Experimental Questions: Please complete this section of your write-up as you work on the experimental portion of this lab. 1. Hold the grating several inches from your face‚ at an angle. Look at
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The graph below is a plot of displacement versus time of a mass oscillating on a spring. 73. At which point on the graph is the acceleration of the mass zero? a. A c. C b. B d. D 74. At which point on the graph is the velocity of the mass zero? a. A c. C b. B
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destructive thin-film microwave interference; and (b) determine the lattice constant a of an array of thin copper rods from its Bragg diffraction of the incident microwave. Introduction Thin Film Interference When plane electromagnetic wave of wavelength λ is incident on a dielectric surface‚ part of the electromagnetic wave is reflected‚ and part of it is transmitted. If the dielectric is thin‚ i.e. its thickness t is comparable to λ‚ the plane electromagnetic wave will be reflected again at the
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>>> transverse (perpendicular)‚ longitudinal (parallel) * define and apply the following terms to the wave model: medium‚ displacement‚ amplitude‚ period‚ compression‚ rarefaction‚ crest‚ trough‚ transverse waves‚ longitudinal waves‚ frequency‚ wavelength‚ velocity Mechanical Waves -require a medium to propagate -involves the transfer of energy through a medium by the motion of particles of the medium itself -particles moves as oscillations or vibrations around a fixed point Transverse waves (e
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