# HW9 - ECE 473/TAM 413 Homework Assignment#9 Due Friday...

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ECE 473/TAM 413 Homework Assignment #9 Due: Friday, November 7, 2008 For your information Hour Exam 2: Thursday, November 20, 2008, 7:00-8:30 pm, 163 EL 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. 1. A baffled circular piston source with a radius of 10 centimeters operates in air (20˚C). a) For an operating frequency of 10 kHz, what is the distance to the far field? b) For an operating frequency of 1 kHz, what is the distance to the far field? c) For an operating frequency of 4 kHz, what is the zero-to-zero beamwidth? d) For an operating frequency of 8 kHz, what is the – 6 dB beamwidth? e) For an operating frequency of 10 kHz, what is the radiation impedance of the air acting on the piston? The answer should be nonzero values for both the real and imaginary parts. Express answer in rectangular form. f) For the piston source in part (e), what is the radiated acoustic power? The peak amplitude surface displacement is 100 micrometers.
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