Sound speed from resonance tubes

The weather in the morning was rainy and wet which made the decision to use the indoor version of the laboratory.

This was way too many graduated cyclinders. The student groups only used one graduated cylinder and two 1000 ml beakers.

The gear collection was somewhat eclectic. And I forgot the PVC pipe which I use to demonstrate resonant wavelengths. I also failed to remember that a third slinky spring is kept in the sound box just for this laboratory.

Austin and Tommylee 

Use of a beaker works best. The graduated cylinder cab start off filled with water, that water can be poured off into the two beakers. 

Bennie and Leann

Lanve and LizzyAnn

The 1024 Hz tuning fork resonance is hard to pick up aurally. Leann found a way be able to listen more closely by placing the cylinder on the floor.

Lashanna joined Bennie and Leann

Jay-brion, Elvanie, and Brithney

Meramy, Ariana, and Pamella chose to work outside. Inside the room the resonance of another tube can deceive one into thinking that their own tube is resonating. The location of the source of the resonance can be surprisingly difficult to determine with multiple tubes in action.

Pamella adds water as Ariana holds the tuning fork.

Jay-brion testing for resonance

Brithney records data

Valencia records data, Kayla slowly pours water from the beaker into the graduated cylinder, and KC holds the tuning fork. This laboratory works well with three team members.

Although this is the left board, the right side is the last panel from the laboratory

The right board was up first because the RipStik wave was still on the board at class start, folded in half. The sound speeds are all some 20% low. This is thought to be due to the location of the anti-node being just above the end of the graduated cylinder. This would cause the wavelength measurements to consistently come up short and reduce the resulting speed of sound.