MSE 310 Problem Set 1 Solutions 2011 [Review]

MSE 310 Problem Set 1 Solutions 2011 [Review] - MSE 310/ECE...

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MSE 310/ECE 340 Dept. of Materials Science & Engineering Electrical Properties of Materials Fall 2011/Bill Knowlton 1 Problem Set 1 Solutions 1. Ethics: [ABET question] Go to my Courses Website at http://coen.boisestate.edu/bknowlton/bill_knowltonBSU%20Course%20Info.htm a. You will find a section called “ Scientific and Professional Misconduct ”. Read the articles about the physicist Jan Hendrik Schön and stem cell researcher Woo Suk Hwang and the predicament they are in. Comment on what might have gone wrong and/or where they went wrong in their careers that led them to where they are today. An ethically responsible answer. b. Read through the sections “Information on: Academic Honesty” and “Dismissal & Student Code of Conduct” for Boise State. Comment on why Boise State takes this so seriously. Relate your comments to your comments in part a . An ethically responsible answer. c. Explain how might your reflection and discussion with respect to part a and b affect your undergraduate career and career beyond bachelorette degree? An ethically responsible answer. 2. Waves and Wave Motion a. Define the following for a wave in a sentence or two for each: Wavelength, Frequency, Velocity Wavelength: For a periodic wave, the distance between two successive parts of the wave that are in phase (that is, at identical points on the waveform) Frequency: Number of cycles per second ( f = 1/period), that is, the number of complete waveforms, or wavelengths that pass by a given point during each second. Velocity: Speed and direction of a wave. b. Look up and write down the equations that relates i) wavelength, frequency, velocity and ii) energy and wavelength. Define all variables. i) velocity f & hc E where is wavelength, is frequency, h is Planck’s constant and c is the speed of light and E is energy. c. What is the difference between a transverse wave and a longitudinal wave? Use an illustrative example to aid your explanation. In a transverse wave, the particle motion is perpendicular to the direction of the wave velocity. In a longitudinal wave, the particle oscillation is parallel to the direction of the wave velocity. d. Using a graph to help you, explain constructive interference. Perfect constructive interference is when two waves are exactly in phase. The crest of one wave coincides with the crest of the second wave. In the figure directly below, the sinusoidal wave in red shows partial constructive interference (sin[x] + cos[x]) where the initial two waves (cyan & green) have an amplitude of 1 and the final wave has an amplitude of ~1.5 with the same frequency.
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MSE 310/ECE 340 Dept. of Materials Science & Engineering Electrical Properties of Materials Fall 2011/Bill Knowlton 2 e. Using a graph to help you, explain destructive interference.
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This note was uploaded on 10/16/2011 for the course ENGINEERIN MSE 310 taught by Professor Billknowlton during the Spring '10 term at Boise State.

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MSE 310 Problem Set 1 Solutions 2011 [Review] - MSE 310/ECE...

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