Day 164: Wavelength of Sound
How long is a sound wave? What is the relationship between the
wavelength of sound from a Boomwacker and the length of the tube?
(Rather than telling students that the wavelength is double the tube
length, they are going to figure it out themselves.)
Boomwacker, a Vernier microphone and the snap of a finger. Part two: Hit the Boomwacker in front of the microphone and get the
frequency spectrum. What do you notice about the spectrum (see
picture)? Find the frequency of the lowest resonance (first harmonic).
Calculate the wavelength. Repeat for various length Boomwackers. Graph
wavelength vs. tube length. What’s the pattern? Repeat experiment for
Boomwackers capped at one end.