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Quiz20

# Quiz20 - organ pipes with helium gas The velocity of sound...

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220/fall2011 PL20/plqz20.xm for user ajcg (Last updated: Tue Oct 4 11:16:24 2011) Sound Waves Quiz/Exam questions can be viewed and submitted only once , and, once viewed, must be submitted within the allowed elapsed time. (A) The intensity of a sound wave is directly proportional to The square of the speed of sound 1. None of the above 2. The amplitude 3. The square of the amplitude 4. The frequency 5. ____________________ [weight: 1] 4 OK (B) Suppose you design a new type of clarinet that is half the length of the ordinary clarinet that is 66 cm long. How will this change affect the frequency of the lowest note on this new instrument? The frequency of the lowest note will decrease by a factor of two 1. The frequency of the lowest note will not change 2. The frequency of the lowest note will increase by a factor of two 3. ____________________ [weight: 1] 3 OK (C) An organ uses standing sound waves in pipes of different lengths to produce
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Unformatted text preview: organ pipes with helium gas. The velocity of sound in helium is larger than the velocity of sound in air by a factor of v helium / v air = 2.9. How will your prank aFect the tones produced by the organ? Note : An experiment similar to this one is often performed at carnivals, when a performer ±lls his vocal tract with helium gas and then demonstrates his new voice. The pitch of the human voice is determined by the frequencies of standing waves in the vocal tract. There will be no change 1. The notes will all go down in frequency by this factor 2. The notes will all go up in frequency by this factor 3. ____________________ [weight: 1] 3 OK Logout ajcg 220/fall2011 Reading_Quiz Problem Listing https://chip.physics.purdue.edu/cgi-bin/220/fall2011/Inst. .. 1 of 1 12/07/2011 03:10 PM...
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