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# HW5 - ECE 473/TAM 413 Homework Assignment#5 Due Friday...

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ECE 473/TAM 413 Homework Assignment #5 Due: Friday, October 3, 2008 Hour Exam 1: Tuesday, October 14, 2007, 7:00-8:30 pm Hour exams are open book (the text for the course) with one sheet of notes (you can use both sides). Your class notes and lecture notes are not permitted. You can use calculators. Note to graduate students taking the course for 4 hours of graduate credit (NB: only graduate students can receive 4 hours of credit) : For the additional 1 hour of credit, you are required to write a paper (typically about 10 pages, double spaced) that discusses in some detail any topic on acoustics for which the fundamentals of engineering acoustics are explicitly described . The paper needs to be based on 5 peer-reviewed publications. The paper will be due Monday, December 5, 2008. However, I must approve the topic and peer-reviewed publications. For the approval process, prepare a one-page outline (including 5 peer-reviewed citations) for submission Monday, October 6, 2008 . 1. What SPL (re: 20 μ Pa rms ) would be necessary in air (at 20˚C) to cause an rms temperature fluctuation of 1˚K? Provide your answer in dB. For your information, the answer to Kinsler et al’s problem 5.9.2a is ! T T o = " # 1 " \$ % & ( ) p P o \$ % & ( ) . 2. Problem 5.12.7 in Kinsler et al. Use 100˚C at the temperature value instead of 80˚C for parts b, c, and d. 3. A plane wave is propagated in a gas. The propagation speed of the gas is doubled from 360 to 720 m/s. All other quantities identified in bold remain the same. Which quantities change and, for those that change, indicate whether they "increase" or "decrease."

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• Fall '08
• OBRIAN
• Wavelength, Sound pressure, Kinsler, peak condensation amplitude, acoustic pressure amplitude, excess density amplitude

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HW5 - ECE 473/TAM 413 Homework Assignment#5 Due Friday...

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