http://www.ck12.org Chapter 11. Wave Motion and Sound
is much easier to draw transverse waves rather than longitudinal). Note that the tube is CLOSED at one end
and OPEN at the other.(b) Calculate the frequencies of the first three harmonics played in this tube, if the speed of sound in the tube is
340 m/s. (c) The speed of sound in carbon dioxide is lower than in air. If the bottle containedCO2 instead of
air, would the frequencies found above be higher or lower? Knowing that the pitch of your voice gets higher
when you inhale helium, what can we say about the speed of sound inHe.Answers:- (b) 131 Hz, 262 Hz, 393 Hz; formula is same as closed at both ends
- Discuss in class
- (b) 70.8 Hz, 213 Hz, 354 Hz (c) voice gets lower pitch. Speed of sound in He must be faster by same logic.