The velocity of sound by means of resonance tube closed at one end

University of Salahaddin – Hawler Education College Physics Dept. Shaqlawa

Name of experiment
The velocity of sound by means of resonance tube closed at one end.

No. experiment: 5

Name: Goran Kamaran A.razaq
Stage: 1st Class
Group: C
Date: 12/12/2013

Apparatuses:- This lab utilizes the following materials:
Resonance tube
Pail of water
Tuning forks
Rubber mallet
Measuring tape
Thermometer

Thorey:- Fill the tube with water to about 10cm to the open end of the tube. To adjust the level of the water in the tube, move the side bucket up and down in the vertical direction. Use five different tuning forks and the appropriate head of the mallet. Strike the tuning fork with the appropriate mallet above the open end of the tube and slowly start lowering the side bucket so the water level goes down until you hear an increase in sound which is called resonance. Record the location where the resonance occurred and record the height. After you get the first resonance, repeat by lowering the water further down the tube until you get a total of two resonance recordings. Repeat the experiment with a different tuning fork and record the appropriate data.
Data and Table:-

F/HZ
L 1 cm
L 2 cm
L avg cm
1/f (sec)
426
20.0
20.2
20.1
23 x 10-4
384
20.4
20.6
20.5
26 x 10-4
320
24.7
25.0
24.8
31 x 10-4
288
25.4
25.9
25.6
34 x 10-4
256
27.0
27.2
27.1
39 x 10-4

Room Temperature = 9 CO

C= 331 = 336.4 M/S

Discussions:-

I. Objective.
To measure the speed of sound waves in air.

ll. Abstract. This experiment tried to determine the speed of sound waves. To determine the speed, a resonance tube full of water was used and five different tuning forks of known frequency. Each fork was struck above the water level and the water level was slowly moved down until a resonance was heard. The distance where the resonance occurs were recorded and the speed of the waves were determined. The experimental speed of sound was then compared to the calculated theoretical speed of sound. The results obtained were very close to the theoretical speed of sound thus proving that they were precise.

lll. The cause of errors in the process.
1- the rooms noise
2- Before now, we will not work in scientific laboratories.

Mistake ratio OR Error ratio:

Error=

Error= = 1.05