hw11 - Zross, John Homework 11 Due: Apr 10 2007, 4:00 pm...

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Unformatted text preview: Zross, John Homework 11 Due: Apr 10 2007, 4:00 pm Inst: John B Ross 1 This print-out should have 14 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. The due time is Central time. ***** Please remember to carry out your calculations to at least 3 sig figs. Your answers must be within 1 percent of the correct values in order to be score as correct by the server. *************************************** 001 (part 1 of 2) 10 points The area of a typical eardrum is about 4 . 5 10- 5 m 2 . Find the sound power (the energy per sec- ond) incident on an eardrum at the threshold of hearing ( I = 1 10- 12 W / m 2 ) . Answer in units of W. 002 (part 2 of 2) 10 points Find the sound power incident on an eardrum at the threshold of pain ( I 1 = 1 W / m 2 ) . An- swer in units of W. 003 (part 1 of 3) 10 points An outside loudspeaker (considered a small source) emits sound waves with a power out- put of 55 W....
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This note was uploaded on 02/16/2009 for the course PYHS 191 taught by Professor Curtise during the Spring '08 term at Abilene Christian University.

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hw11 - Zross, John Homework 11 Due: Apr 10 2007, 4:00 pm...

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