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Unformatted text preview: Physics 2 C Spring 2009 Quiz 1A Nam e___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) As you stand by the side of the road, a ca r approa ches you at a constant speed, sounding its horn, and you hear a frequency of 76 Hz. After the ca r goes by, you hear a frequency of 65 Hz. What is the speed of the ca r? The speed of sound in air is 343 m /s. A) 38 m /s B) 27 m /s C) 17 m /s D) 22 m /s E) 34 m /s 1) 2) A string has a thick half and a thin half. A pulse propagates along the thin half and encounters the thick region and is partially reflected. The reflected wave will be_________ and have __________ than the transm itted wave. A) inverted, a slower speed B) inverted, a faster speed C) inverted, the sam e speed D) uninverted, a faster speed E) uninverted, a slower speed 2) 3) A standing wave in an open pipe 0.46 m long vibra tes at the third harm onic in this situation the distance from the center of the pipe to the nearest antinode is A) zero B) 7.7 cm C) 5.3 cm D) 3.8 cm E) 12 cm 3) 4) Two steel wires are stretched with the sam e tension. The first wire has a diam eter of 0.610 m m and the second wire has a diam eter of 0.910 m m . If the speed of waves tra veling along the first wire is 54.0 m /s, what is the speed of waves tra veling along the second wire? A) 100 m /s B) 27.2 m /s C) 24.9 m /s D) 81.0 m /s E) 36.2 m /s 4) 5) Two in‐phase loudspeakers a re 3.00 m apart. They em it sound with a frequency of 490 Hz. A m icrophone is placed half‐ way between the speakers a nd then m oved along the line joining the two speakers until the first point of constructive interference is found. At what distance from that m idpoint is that first point? The speed of sound in air is 343 m /s. A) 0.350 m B) 0.175 m C) 0.700 m D) 0.500 m E) There is no point in that line where constructive interference occurs. 5) 6) Two people are talking at a distance of 3.0 m from where you are and you m easure the sound intensity as 1.1 × 10‐ 7 W/m 2 . Another student is 4.0 m away from the talkers. W hat sound level 6) does the other student m easure? A) 40 dB B) 35 dB C) 48 dB 1 D) 60 dB E) 55 dB Answer Key Testname: QUIZ 1 1) B 2) B 3) B 4) E 5) A 6) C 2 ...
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