a.) The period of the waveform is T = 4 x 10-3 s = 4 ms.
b.) Given the 4 ms period of the waveform, the frequency of the waveform is
f = 1/T = 250 Hz. The pure tone sounds used to synthesize this waveform would come from a harmonic series having a fundamental with frequency 250 Hz. The next three elements of this harmonic series have frequencies 500, 750 and 1000 Hz.
c.) The amplitude of the waveform is p = 3 N/m2.
d.) The sound level associated with this waveform is computed from the amplitude,
p = 3 N/m2. The sound level isSound Level = 20 log ( p / p0)
Sound Level = 20 log ( 3 N/m2 / 2 x 10-5 N/m2)
Sound Level = 20 log ( 1.5 x 105) = (20)(5.2) = 104 dB
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Last updated: 30 Oct 1999
Comments: bland@indiana.edu