Phys 222 Spring 2007Exam 2, Wed 28 March, 8-9:30pm Closed Book, Calculators allowed Turn off all cell-phones, beepers, pagers, iPods, MP3s.. Any call will result in the end of your exam Each question is worth one point, answer all questions Please START from Question 25 Fill in your Last Name, Middle initial, First Name Your ID is the middle 9 digits on your ISU card. Please fill in your recitation section in special codes K to L For the H1 section please use section 18 At end of exam, please put exam writeup back in the folder, this allows you the chance to appeal the gradingBest of luck, Craig Ogilvie
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25. Weak background noises from a room excite the fundamental standing wave in a cardboard tube of length L = 67.0 cm with two open ends. Assume that the speed of sound in the air within the tube is 343 m/s. What frequency do you hear from the tube?a. 256 Hzb. 512 Hzc. 1024 Hzd. 10.2 Hze. 2.56 Hz256Hz0.67m)*2343(m/s)/(v/(2L)v/f,2=====>==λλλfvL26. The figure shows a sound source Sthat is moving to the right. The source emits sound at a certain frequency, and three stationary sound detectors detect the sound. Rank the detectors according to the frequency of the sound they detect from the source, greatest first. There is no Doppler shift for observer 3 since the motion of the source is at right-angles to that observer.