1.6. The E-k relation of phonons of GaAs is shown below. Discuss, preferably in less than 20 words, the reason for an energy gap exists between LO and LA phonon bands at the zone boundary (K a). TO LA
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- Consider the following series of poly(phenylene oxide) polymers A–D, and their glass transition temperatures. Explain how the differences in structure can account for the differences in TgWhat is the Madelung constant for MgO (rock salt) structure? Include only the first 3 terms. Give your answer to 3 significant figures.why is lupac for Hg2Cl2 Mercury (I) Chloride, instead of Mercury (II) Chloride?
- Discuss glass transition temperature and the factors affecting GTT and what are its significances. Give detailed answer please3..Suggest how to make syndiotactic/isotactic polystyrene on the one hand and on the other hand how to synthesize atactic polystyrene. Justify your statement.The UV–visible spectrum of GLB-1 is given in Figure 2. i.What colour(s) will the deoxy and oxy forms of GLB-1 be? Note, an electromagnetic spectrum is reproduced in the Assessment area on the S315 website. ii.By comparing the bands on the right-hand side (around 550 nm) with those of oxy- and deoxymyoglobin, suggest what type of transition gives rise to these bands.
- How much is the energy required for vacancy formation for Pb at its melting temperature of 620.6°F if the fraction of atom sites that are vacant is 2.41x10-5? Solve LegiblyUsing a simple infinite barrier approximation, calculate the “effective bandgap” of a 10 nm GaAs/AlGaAs quantum well grown along [001] direction. If there is a one-monolayer fluctuation in the well size, how much will the effective bandgap change? This example gives an idea of how stringent the control has to be in order to exploit heterostructures.We have a pink crystals of an ionic compound of an f- block element (M). The crystals house the octahydrate [ M(H2O)8]3+ and an anion which is not chloride and does not luminesce under UV. (A) First, draw and label a plausible solid-state geometry for the hydrated cation. (B)Provide ALL potential identities for the f- block element, M, based on the information supplied above, defending your choices and discussing the applicable chemical concepts. (C)What are the potential solid state MCI3 geometries and coordination numbers for ALL of the components proposed in section (B)? Explain briefly why, focusing on the key chemical principles. (D) In ion - exchange chromatography, which of the trivalent f-block ions indicated in component (B) would you anticipate to elute first? Explain your response, emphasising the important chemical concepts.
- 1.Why are the chlorophylls less mobile than the carotenes on the TLC plate? Give athorough explanation, including a sketch of how each type of molecule would interactwith the silica stationary phase material (you can use schematic structure formulas, ratherthan draw the whole molecules, which are quite large!). For instance, would one of thosetypes of molecules create more intermolecular force interactions than the other?Compute the repeat unit molecular weight for nylon 6,6Pls do Asap...! And give brief explanation ...!