13. one point, from Lectures 13 and 14, short answer

(a) .3 from Lecture 13, Waves on String. When I varied the tension in the string with the strobe light, what two wave properties changed and what one stayed the same, and why? (.3) By wave property I mean wavespeed, frequency, wavelength.

(b) .3 from Lecture 13, Waves on Larynx. When I inhaled helium and sulfur hexafluoride, what wave property changed, and what stayed the same, and why? (.3)

(c) .4 from Lecture 14, Moving Wave Sources. What are the Doppler effect and a shock wave? Define (.2) and give an example of (.2) each.

Revised September 25, 1997.