Question

The vocal cords, two lipshaped memrane folds in the upper trachea as indicated in the figure, are responsible for vocal sound production. The voices of males and females often have different sonic characteristics: Male vocals have an average fundamental frequency of about 140 Hz, while female vocals have an average of about 230 Hz.

Figure: https://www.mayoclinic.org/-/media/kcms/gbs/patient-consumer/images/2013/11/15/17/42/ds00670_-ds00366_im02764_r7_openclosethu_jpg.jpg

a) Using the frequencies given, calculate the wavelengths of average male and female vocals in air.

b) Draw two horizontal lines to indicate a "tube," closed at the left (where the glottis closes the vocal chord) and open at the right (lips). For the air displacement (not for pressure), at which side will there be a node (i.e. where there is no room for air displacement back and forth)?

c) At which side will there be an antinode (i.e. where air is oscillating back and forth)

d) Draw the fundamental (lowest frequency) standing wave that will occur in that open-closed tube.

e) What two lengths would your tube need to be to result in the female and male fundamental frequencies given above?

f) Use the figure provided to explain whether or not it is accurate to simply model your vocal cords an open closed tube that produces sound when the vocal cords are closed.

Answer 1

Hit like if you understood.

140 Hz , wave 4 343 MS1 for femele for female 230 Hz ポーWI r.e. near our lips of mouth Drauing for La 0.313 m 31.3 m closing vocal chox 6.2s im mal ーーーーナー あーcompared-Fo OiYnal kngtas so it's not an accurate mode).