Classes Used: PHYS 101, 153

sit the trombone on top of the speaker and connect the speaker to a function generator (3 kHz works best).

( PS : When the input signal is of the frequency of 3 kHz, the first destructive interference happens at the distance of 3 cm, and the first constructive interference happens at the distance of 6 cm , the second destructive interference is at the distance of 9 cm , all those three points can be easily demonstrated from the trombone. )

By sliding the trombone out, you can observe where destructive interference occurs. A neat thing you could have students do is given the speed of sound and frequency, have them find this sliding distance. Updated on: 01/06/15