What are the principal advantages and the principal limitations of each of the detectors listed in (a) thermal conductivity, (b) flame ionization, (c) electron capture, (d) therm- ionic, and (e) photoionizatio
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Q: the minimum sample size n needed to estimate μ for the given values of c, σ, and E.
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- What limits a) spatial resolution b) accuracy of elemental composition (how accurately the elements present in the sample are determined) in an energy dispersive x-ray spectroscopy analysis?1. On a typical Atomic Absorption Spectrophotometer, what are the detection limits for iron? (i.e. What are the maximum and minimum concentrations that can be measured?) 2. What happens when the existing concentration of ions, substituted into a Ksp expression, exceeds the numerical value of Ksp?Will quantitative fluorescence spectroscopy be as sensitive to path length differences in sample cells as quantitative UV-visible spectroscopy? Explain. What are some of the potential pitfalls of parts per billion analysis?
- 25. A radiograph made with an exposure of 12 mA per minute has a density of 0.8 in the area of interest. It is desired to increase the density to 2.0 in this area. By reference to a characteristic curve of the film, it is found that the difference in log e between a density of 0.8 and 2.0 is 0.76. The antilogarithm of log 0.76 is 5.8 (relative exposure factor). What must the new exposure time be to produce a radiograph with a density of 2.0, assuming the first exposure time was 1 minute?A single-walled carbon nanotube has 2.3x 1019 carbon atoms per m2 along its surface. The nanotube diameter is 1.4 nm. (a) Find the mass density of the nanotube in kg/m3. (b) Compare your answer to (a) with the density of steel, about 7800 kg/m3.1. In your own words, explain the difference between systematic and random error in measurement. 2. In your own words, define validity and reliability. 3. What is Cronbach's Alpha? What does it measure?
- 1. Given the following SIR diagram, where h are some costly self-protective activities that people can take to avoid contracting the disease. h(p, I) = nl - apl + C. C is a constant, p is the price of costly self-protective activities. Birth (BI, – h(p, l))S. Susceptible Infected Ads St Death ds (a) Write down dt (b) Solve for the steady state infected population I*. (c) Calculate the prevalence elasticity of self-protection.What are the pros and cons of a CZT detector over an HPGe detector in terms of energy resolution, counting efficiency (considering the typical size of the detectors), cooling requirement, complexity (from the user’s point of view), portability, size and mass, etc.? What is your expectation for the market of the room-temperature semiconductor detectors for the next 10 years?Q1: Calculate electrons and holes concentration in a germanium sample . If T-300 K, Nd=5×10¹%/m³, N₁-0. Assume that n=2.4×10¹9/m³. (Ans: 5.97×10¹9/m³, 9.65×10¹8/m³)
- 5.6 Problems 1. (Zemansky and Dittman, Problem 9.4) Derive the following equations: a) ´ƏF/T` U = F - T ƏT = -T2 ƏT b) 2²F Cy = -T ƏT? c) ´aG/T H = G-T aT -T2 d) Cp = -TA student wants to deposit nanomaterial on a flat surface of a substrate as in the figure. What are the step in order he/she will need to follow Substrate Select one: a. Positive resist exposure -> deposition -> development -> Ilif-off b. Negative resist exposure -> development -> deposition -> lif-off c. Negative resist exposure -> deposition -> development -> lif-off O d. Positive resist exposure -> development -> deposition -> lif-off.Note: handwritten solutions are strictly prohibited..and don't use any ai bot