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Unformatted text preview: you hear? Does your initial distance from the source
affect the change in loudness?
(ii) Calculate the intensity (in W/m2) and sound level (in dB) as function of distance r
from the source (in m). At what distance r is the sound level equal to 120 dB (the
threshold of pain), 65 dB (corresponding to ordinary conversation, and 20 dB (a
whisper)? Typical home stereo loudspeakers require a few W of input power to Physics 2214, Spring 2012 2 Cornell University TA's Name:_____________________________________Section: ____
Your Name: ____________________________________
produce average rock music loudnesses. Is this consistent with your
calculations? 5. Why all the wood? Why aren’t guitars (and cellos and violins) just boards with
strings stretched from one end to the other?
(a) If you play the same note (e.g., corresponding to the same key on a piano), how
do the fundamental frequencies of the three instruments compare?
(b) If you play the same note by plucking a string in the same way on each
instrument, the resulting sounds will be quite dif...
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