- #1

the-pal

- 4

- 0

(a) What is the shortest length that will cause a loud note?

(b) If the pipe is 1.5 m long, how many loud notes will you hear as the plunger is withdrawn?

2. Relevant formulae are

For closed pipe, first harmonic λ = 4L , f¹ = v/4L f³ = 3v/4L = 3 * f¹

3. Answers

(a) Rearranging the formula to get:

L = v/4f¹

L = 330/4*256

L = 330/1024

L = 0.32m or 32.2cm

(b) i thinking that i need to look for the 3rd and 5th harmonics to see how the length I'd affected but i calculate this to be smaller and therefore not really affected by a longer tube! Help?