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1CT 1.2.2If I whack a ruler hanging off thedesk, I can make a “note”.What happens if I move it back soless hangs off the edge, but Iwhack it just as hard?A) Pitch , loudness similarB) Pitch similar, loudnessC) Pitch , loudnessD) Pitch , loudness similarE) Something elseWHY?CT 1.2.3What determines pitch?Which is the most important featureof the instrument/source ofsound?A) Length/sizeB) “Bendability”/rigidityC) Heaviness/density of materialD) Amplitude (how hard it is struck)E) More than one of the aboveCT1.2.4Let’s fill the Tibetan singing bowl withwater. What happens to the pitch ofthe tone it makes?A) goes upB) goes downC) pretty much unchangedD) no way to know this withouttryingWhy?CT 1.3.1The picture shows “displacement as a functionof location along a string”What is the wavelength (“λ”)?e) None of theseabcdWhat is the amplitude?x2A dust particle is located in front of aspeaker. The speaker moves back and forth ata constant rate, creating a loud sound wave.Which choice below shows the motion of thedust particle?speakerdustCT 1.3.2xA) (up and down)B) (pushed steadily to the right)C) (left and right)D) (no motion)E) (circular path)I grab the left end of a LONG string andwiggle it up and down. There is a purplepainted spot somewhere on the string.What choice below best shows the motionof the purple spot?A) (up and down)B) (pushed steadily to the right)C) (left and right)D) (no motion)E) (circular path)CT 1.3.3x CT 1.3.4xTransverse and longitudinal• Which one of the following ismost likely to be impossible?A: Transverse waves in a gasB: Longitudinal waves in a gasC: Transverse waves in a solidD: Longitudinal waves in a solidE: They all seem perfectly possibleCT 1.4.1Approximately how close is a thunderstormif you see lightning flash and hear a clashof thunder after counting up to 6 seconds?(the speed of sound is 344 m/s)a) 0 kmb) 1 kmc) 2 kmd) 6 kme) None of these3CT 1.4.2You are traveling on a commercial airplane (saya Boeing 757). Relative to the speed of soundyou are traveling:a) much slower than soundb) a little slower than soundc) the same speed than soundd) a little faster sounde) much faster soundCT 1.4.3Sound travels at a speed of 344 m/s (770 mph).How fast does the air flow out of my mouth as Ispeak?a) Much slower than 344 m/sb) 344 m/sc) Much faster than 344 m/sCT 1.4.4In which of the following venues can you noticea difference between the music you perceiveand the movements of the musicians (i.e. canyou tell that the sound has traveled a distance?)a) The rear of the Fox Theaterb) Pepsi Centerc) Red Rocks amphitheaterd) All of the aboveCT 1.4.7Which sounds travel the fastest through air?a) Higher pitchb) Lower pitchc) Louder soundsd) Quieter soundse) They all travel at the same speedSpeed of sound4CT 1.4.5In a 32 o C room sound travels…a) > 344 m/sb) 344 m/sc) < 344 m/sWhat if the room is 32o F? Does the soundtravel faster or slower than a 32o C room?a) Fasterb) Slowerc) Same speedCT 1.4.6When sound travels from a source to a listener,what do air molecules never do?a) Travel from the source to the listener at344 m/sb) Move back and forth with the frequency ofthe sound wavec) Bump into other air moleculesd) Move in the direction of wave propagatione) Air molecules do all of the aboveCT 1.5.1If there is really a force of 105 N (that’s100,000 N!) on each square meter of a glasswindow, why is it that the window does notshatter?a) That is such a small force it does notmatterb) The total force exerted on the window isnot equal to zeroc) Glass is stronger than you thinkd) There is an equal but opposite forcepushing against the window from the othersidee) Gravity counteracts the forceCT 1.5.2I stand on a scale with both feet and measureMy weight. If I stand on one foot, does thereading:a) Increaseb) Decreasec) Remain the sameI weigh 500 N, what is the force on each foot?a) 500 N eachb) 250 N eachc) It depends on the area of my foot5CT 1.5.2What is the area of my feet in m2 (Hint: my feetare very roughly 25 cm x 8 cm)?a) 200b) 20c) 2d) .2e) .02CT 1.5.2What is the approximate pressure on eachfoot?a) .125 N/m2b) 125 N/m2c) 1250 N/m2d) 1.25x105 N/m2e) Not enough informationConvert this to atmospheresa) 1.25x10-5 atmb) 1.25x10-3 atmc) 1.25 atmd) 125 atme) 1.24x105 atmCT 1.5.3I stand on both feet, when I lift one foot up thepressure on the other foot (the one thatremainson the ground)…a) Increasesb) Decreasesc) Remains the sameCT 1.5.4Who is more likely to damage a hardwooddance floor?a) A 250 lb cowboy wearing boots with 6 cmx 6 cm heelsb) A 100 lb waif-like woman wearing 1 cm x 1cm high heelsc) They will do equal damaged) Not enough information to make aninformed choice6CT 1.5.5When the air is sucked out of this barrel, whatis going to happen to the barrel?a) The barrel will explodeb) The barrel will completely collapsec) The barrel will collapse halfwayd) Absolutely nothing, it’s a reinforced steelbarrel!e) I have no ideaCT1.3.xxIf a big collision occurs in deep,empty outer space (two asteroidsslam into one another, surroundedby “vacuum”),Does it make a sound?A) SureB) Sure (if there’s an astronaut there to hear it)C)


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