Waves 21. A guitar string has a fundamental frequency of 82.4 Hz. At which of the following frequencies will this string NOT vibrate? (which is not an overtone?) a. 41.2 Hz b. 247.2 Hz c. 329.6 Hz d. 164.8 Hz 22. An 80-Hz standing wave is on a 3-m string between two walls that looks like the image below as it vibrates. What is the speed of the traveling waves that cause it? a. 96 m/s b. 80 m/s c. 48 m/s d. 800 m/s 23. Two neighboring notes are being played on the piano: middle C at 262 Hz and B at 247 Hz. How many beats occur each second? a. 15 beats per second b. There are no beats c. 1.06 beats per second d. 247 beats per second