nuc med essays

nuc med essays 1. When a tuning fork is held up to an ear and rotated, the orientation causes differing intensities in sound. In this case, if the tuning fork is held so the widest edge is parallel to the ear, the sound is the loudest. If it is held perpendicularly to the ear, the sound is moderately loud. If the fork is held at a 45-degree angle, the sound is still present, but it is the quietest of the orientations. 4. We counted a total of 7 cycles over a period of .02 seconds. We can conclude that one cycle was completed in .00286 seconds. Taking the inverse of this gives us a frequency of 350 Hz. The frequency given for this particular tuning fork was 349.2 Hz. 5. For the next part, two tuning forks, labeled 349.2 and 341.3 Hz respectively were both struck and then measured at the same time. The resultant graph of sound pressure vs. time is not a basic sinusoidal wave. The wave now looks like a normal sinusoidal wave, except the waves maximum amplitude oscillates over time. It is difficult to tell the specific component frequencies. However, it is possible to take the frequency of the beats, and this frequency is the difference between the two component frequencies. In this case, the period of the beats was about .12 seconds, which translates to about 8.333 Hz. This is approximately the difference between the frequencies of the two tuning forks used. 6. On the graph of the Fourier transform, the largest peak shows up at 347.9 Hz. This is reasonably close to the tuning forks actual frequency of 349.2 Hz. Other, much smaller peaks also show up at 695.8 Hz and 2154.54, which are two times, and six times the initial frequency, respectively. A similar behavior was observed with the other tuning fork. On this one, the Fourier transform graph shows the highest peak at 341.8 Hz. Smaller peaks can be seen at 677.49 Hz, and 2099.61 Hz. These frequencies are again two times, and six times the initial frequency, respectively. ...