a. A person who has just inhaled helium gas speaks with a high pitched voice. Discuss why this happens given that your larynx and other parts of your repiratory passages act rather like a resonance tube, with your vocal chords producing the necessary energy to vibrate the air.

The frequency and wavelength of a transverse wave on a string are 340 Hz and 0.70 m, respectively. The tension in the string is 310 N. What is the linear density of the string? Linear density = i

In the arrangement shown in Figure P14.40, an object of mass, m = 2.0 kg, hangs from a cord around a light pulley. The length of the cord between point P and the pulley is L = 2.0 m. Vibrator e W Pulley Figure P14.40 (a) When the vibrator is set to a frequency of 145 Hz, a standing wave with six loops is formed. What must be the linear mass density of the cord? kg/m (b) How many loops (if any) will result if m is changed to 2.88 kg? loops (c) How many loops (if any) will result if m is changed to 72.0 kg? loops

A guitar with strings of length L = 0.65 m has new strings put on it. The low E string has a linear density of ρ = 0.0069 kg/m and when tuned properly should produce a fundamental tone of ν = 82.41 Hz. a. What is the proper tension the string should be under, in Newtons?  b. If the string was mistakenly tuned to high E (ν = 330 Hz) what would the tension be, in Newtons? (Note that in reality, the string would likely break!)