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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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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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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the transmittance at each wavelength on a table from 400 to 720. The information on Figure 1 came from the leaf extract on the paper chromatography that we used; with the help of acetone we saw the spectrum and the differences of the different pigments. Percentage transmittance in Table 1 show that the lower the number‚ the more dense that solution is at that specific wavelength. As the numbers get higher‚ the less dense it is and if the number is 100 at a specific wavelength then the solution was clear
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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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absorbing species. Beer’s Law states that A = ebc‚ where e is a constant of proportionality‚ called the absorptivity. Different molecules absorb radiation of different wavelengths. An absorption spectrum will show a number of absorption bands corresponding to structural groups within the molecule. In this experiment wavelength range between 400-650nm is used in order to detect in the visible range. Steel is an alloy primarily composed of iron with carbon content between 0.02% and 1.7% by weight
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