Peer-review ID: B503 Reviewer’s name: _________________ umn ID number: _________________ Photoelectric effect: using a monochromator to measure electron energy as a function of incident photon frequency to determine Planck’s constant John Greavu Partners: Daniel Erickson and Kevin Haar School of Physics and Astronomy‚ University of Minnesota‚ Minneapolis‚ Minnesota 55455 24 March 2014 The energy of ejected electrons from the cathode end of an electrode due to the photoelectric effect
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spread sheet that shows the baseline system performance. Optical Power | | | Source Power | 20.0000 | [mW] | | Source Power | 13.0103 | [dBm] | | Source-to-fiber coupling loss | 5.8000 | [dB] | | Fiber loss @ source mean wavelength λo | 0.2000 | [dB/km] | | Link length | 90.0000 | [km] | | Link fiber loss | 18.0000 | [dB] | | Fiber-spool length | 10.0000 | [km] | | Number of spools (max length 10 km) | 9.0000 | [--] | | Number of fiber splices | 8.0000
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reflected or refracted‚ and how EMR reacts with matter depends on the properties of the material‚ based on the frequency‚ wavelength‚ absorbance etc. The electromagnetic spectrum shows representative molecular processes that occur when light in each region is absorbed. The visible spectrum spans the wavelength range 380-780nm‚ so each region is absorbs at different wavelengths. The red-orange complex that forms between Iron (II) and 1‚10-phenanthroline is useful for the determination of iron in water
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light passes into a material at an angle‚ the light beam is bent or refracted according to Snell’s Law and the index of refraction of the material. But also‚ the speed of light through a material varies slightly with the wavelength or frequency of the light. Thus‚ each wavelength is refracted at a slightly different angle when passing through a material at an angle. This spreading out of beam of light is called dispersion. Types of Dispersions and ways to reduce: Chromatic Dispersion: Chromatic
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photosynthesis comes from absorbed photons found in light and involves a reducing agent‚ in this case water. The second lab is about the spectrophotometer where they learned that it’s an instrument that measures the amount of light of a specific wavelength that passes though the medium. Introduction: The purpose of this lab experiment is to separate plant pigments using paper chromatography‚ and to measure the rate of photosynthesis in isolated chloroplasts. Because of capillary action the solvent
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comparing the wavelength of 540 nm (see Tables 1 & 2) with the its corresponding color in Figure 5‚ the green is almost a turquoise. Since this color is closer to blue‚ the fastest photosynthesizing wavelength‚ it answers the question as to why it came before red and yellow (see Figure 7). From the results‚ it can be concluded that the level of photosynthesis depends on the level of energy the light carries‚ and its absorbency. The energy of the light is inversely proportional to the wavelength‚ so a long
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They are Cadmium Sulphide (CdS) and Cadmium Selenide (CdSe). Extrinsic devices have impurities added‚ which have a ground state energy closer to the conduction band since the electrons don’t have as far to jump‚ lower energy photons (i.e. longer wavelengths and lower frequencies) are sufficient to trigger the device. Two of its earliest applications were as part of smoke and fire detection systems and camera light meters. The structure is covered with glass sheet to protect it from moisture and dust
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of visible light. Each of these colours has a different wavelength - red light (at one edge of the rainbow) has a wavelength of ~650 nm‚ whilst violet light (at the other edge) has a wavelength of ~400 nm. When light travels from one medium (say air) to another (water)‚ it changes speed‚ and if the light enters at an angle‚ it will bend. This is known as refraction. Shorter wavelength light (such as violet) refracts more than longer wavelength light (such as red). You can see white light splitting
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predict that the wavelength intensity will affect the rate of photosynthesis more than light intensity will. 2. Data: # ATP | Light Intensity (Lux) | Time Elapsed | 1 | 40 | 0:04 | 1 | 80 | 0:04 | 2 | 80 | 2:10 | 1 | 120 | 0:04 | 2 | 120 | 1:27 | 3 | 120 | 2:51 | 1 | 160 | 0:04 | 2 | 160 | 1:06 | 3 | 160 | 2:09 | # ATP (produced at 3:00 minutes) | Light Intensity | 1 | 40 | 2 | 80 | 3 | 120 | 3 | 160 | Data Continued: # ATP | wavelength change (nm) | Time
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------------------------------------------------- Types of chromophore Conjugated chromophore that straightens in response to a photon γ (light)‚ of the correct wavelength: 11-cis-retinal becomes all-trans-retinal Chromophores almost always arise in one of two forms: conjugated pi systems (also known as resonating systems) and metal complexes. [edit]Conjugated pi-bond system chromophores In the conjugated chromophores‚ the electrons jump between energy levels that are extended pi orbitals
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