Quiz+2

# Quiz+2 - lowest three frequencies when the student would...

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Fall 09 7C Quiz 2 Student ID:_______________ Name:______________, ______________ | ____| (Last) (First) DL Sect. # I certify that I will abide by the UC Davis Code of Academic Conduct. .. Signature:_________________________ Problem 1 (85%) Two loudspeakers are placed in front of the 7C class and are both wired identically to an amplifier. They therefore both play the same one frequency and the two speakers are in phase. A student is seated 20 meters from one speaker and 23 meters from the other. As the frequency of the sound waves from the speakers is gradually increased from 20Hz to 20,000 Hz, what are the lowest three frequencies at which the student will hear a minimum volume? What are the
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Unformatted text preview: lowest three frequencies when the student would hear a maximum volume? Problem 2 (15%) Explain why a cello plays lower frequencies than a violin. What two (non destructive) things can I do to the cello so that it plays tones closer to that of a violin? (In case you are unfamiliar with these musical instruments, you should know that both are string instruments with similar shapes. The cello, however, is much larger than the violin in all dimensions and has heavier strings.) x = dsin , x = n = 2L n , f = nv 2L node − node f = 1 T v sound = 330 m / s = 4L 2n − 1 , f = 2n − 1 v 4L node − antinode v = f Rubric Code:...
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