Physics

Solution Library


Melt Viscosity at 140 Degrees C and Zw is 900

Question A polymer with a Tg of 110°C and a Zw of 400 was found to have a melt viscosity of 5000 Pa.s at 160°C. What is its melt viscosity at 140°C when Zw = 900? [Hint: Combine the WLF equation with the DP dependence]. Summary This question belongs to physics and discusses about mel ... Read More

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Radial Wave Function of a Mass Moving in a Spherically Symmetric Potential

Question Summary This question belongs to physics and discusses about radial wave function of a mass moving in a spherically symmetric potential. Word count: NA   ... Read More

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Oceans  and its Physical Properties

Question The physical properties of water make it a very unusual substance and determine many of the properties of the oceans. Here are two simple experiments that can help us investigate how things dissolve in water and how water freezes. Experiment Materials: A glass (with a smooth even rim), ... Read More

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Properties of Oceans and Freezing Properties of Water

Question The physical properties of water make it a very unusual substance and determine many of the properties of the oceans. Here are two simple experiments that can help us investigate how things dissolve in water and how water freezes. Materials: 4 glasses (8 to 12 oz.), water, salt, food col ... Read More

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Integrated Circuits of Patterning Aluminum by Plasma Etching and Patterning of Copper by Damascene Plating

Question Very- large-scale integration (VLSI) of integrated circuits (ICs) is the combination of thousands of transistors on a single piece of silicon wafer. Metallic interconnects from one transistor to another on the silicon wafer make VLSI possible. Plasma etching is a process in which the plasm ... Read More

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Formation of Sputter-deposited Aluminum

Question Plated copper is more conductive than sputter-deposited aluminum which leads to less hat and smaller ICs but copper is more expensive than aluminum. If you could electroplate aluminum from a ionic liquid solution in a structure like figure 2, then can you have a better IC? Than with an IC ... Read More

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Differential and Integrated Capacitance of the Pt/solution Inter phase

Question When a power supply brings an electrode in an ionic solution to a potential versus a reference electrode, then the electrode surface and adjacent layer of solution store charge like two plates of a parallel plate capacitor. The inner potential drop between electrode surface and adjacent la ... Read More

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An Ideally Non- Polarizable Electrode-Multiple Choice Question 

Question An ideally non- polarizable electrode  Exchange electrons with species in solution Does not exchange electrons with species in solution Changes potential as electrodes pass through the non- polarizable electrode Does not change potential as electrons pass through the non-polariz ... Read More

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A Reference Electrode-Multiple Choice Question

Question A reference electrode is a good letter of recommendation is an ideally polarizable electrode has a fixed inner potential difference between a particular electrode and a particular electrolyte solution is an ideally non- polarizable electrode b and c c and d none of the above &n ... Read More

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Inner Potential-Multiple Choice Question

Question The inner potential is the electric potential within a phase cannot be measured is a measurable quantity a and b a nd c none of the above     ... Read More

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Calculation of Electrical Power Density Produced by the Fuel Cell-Multiple Choice Question

Question The fuel cell is operating with a current density, j of 0.3A/cm3,  and a cell voltage, Vcell of 0.6 volt, as it uses hydrogen as the fuel and oxygen as the oxidant. What is the electrical power density (in Watts/cm2) produced by the fuel cell? 6 Watt/cm2 3 Watt/cm2 18 Watt/cm2 0 ... Read More

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Calculation of Electrical Efficiency Produced by the Fuel Cell-Multiple Choice Question

Question A fuel cell converts the chemical energy in fuel and oxidant to electric energy (as shown in the figure to the right). The reversible potential for the hydrogen electrode, E0H2, is 0 volt versus the reversible hydrogen electrode (RHE). The reversible potential for the oxygen electrode, E0O ... Read More

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