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# HW11 - ECE 473/TAM 413 Homework Assignment#11 Due Friday...

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ECE 473/TAM 413 Homework Assignment #11 Due: Friday, December 5, 2008 For your information Final Exam: Tuesday, December 16, 2008; 1:30 - 4:30 pm, 163 EL 1. Calculate the lowest 10 normal modes (eigenfrequencies in Hz) for a rigid-walled rectangular room of dimensions L x = 3.12 m , L y = 4.69 m and L z = 6.24 m . Use air at 20˚C. 2. Problem 9.5.2a in Kinsler et al. 3. Problem 9.5.4 in Kinsler et al. 4. Problem 10.2.1 in Kinsler et al. 5. Problem 10.3.2 in Kinsler et al. but for L = 2 m. Use flanged approach. 6. An acoustical tile is placed at the end of a pipe with radius small compared to the wavelength. At the beginning of the pipe a piston is used to generate a 200 Hz acoustic plane wave. A very small microphone is inserted into the pipe via a small slot in the bottom so that it can be moved and used to measure the pressure amplitude as a function of distance from the end (x = L), without affecting the acoustic field. Using the microphone a standing wave ratio of 12 is measured and the first pressure minimum is found to be 0.4 m from the end (x = L). (a)

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HW11 - ECE 473/TAM 413 Homework Assignment#11 Due Friday...

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