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1. What arc the fundamental differences between a thermal and a photon (quantum) d etector?
2. Assuming an in terband absorption mechanism, what is the cutoff wavelength for a semiconductor with a bandgap of 0.2 eV? What is it if the bandgap is 0.02cV?
3. Calculate the electron transit time and device gain for a photoconductor under these conditions: distance between contacts=50 µm, applied voltage=lO V, minority carrier lifetime=2 x l0-7 s, J..ln = l 0000cm 2 !Vs, and J..lP = I OOOcm 2 / Vs .
Use Friedman test to find out whether there is evidence for significant difference between two population variance. Use .05 level of significance.
Instructions: For each abstract, indicate whether the study is observational or experimental, and then indicate the population being studied and the dependent and independent variables.
Affirmative action commitments by industrial organizations have led to an increase in the number of women in executive positions. Satellite Office Systems has vacancies for two executives that it will fill from among four women and six men.
in 1997 frequent flyer magazine reported that 71 of frequent fliers surveyed complained that they had difficulty
a die is tossed 90 times. find the standard errror for the number of sixes
the amount of time a bank teller spends with each customer has a population mean ?x 3.1 minutes and population
suppose that college faculty with the rank of professor at tow-year institutions earn an average of 64571 per year with
Provide two examples for each source of measurement error and include how each example might likely influence research results.
in a class of 50 students the result of a particular examination is a true mean of 70 and a true variance of 12. it is
use a table of cumulative areas under the normal curve to find the z-score that corresponds to the given cumulative
The distribution of diastolic blood pressures for the population of female diabetics between the ages of 30 and 34 has an unknown mean μd and a standard deviation σd = 9.1 mm Hg.
Determine and interpret the p-value for the test. Source: John Diamond, "Some Veterans Suffer Bone, Muscle Ailments," The Indiana Gazette, January 22, 1997, p. 5.
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