Speed of Sound Lab

Purpose: The purpose of this lab is to determine the speed of sound using the principle of resonance. "Resonance is the prolongation of sound by reflection; reverberation." (www.dictionary.com)
Materials: Resonance tube, large graduated cylinder, meterstick, and two different frequency tuning forks.


SPEED = FREQUENCY x WAVELENGTH (λ)




sciencesoundlight.JPG


Data:

Length of tube when resonance occurs
16.25
24
Diameter of tube (cm)
4
4
Diameter of tube x 0.4 (cm)
1.6
1.6
1/4 Wavelength (m)
17.85
25.60
Wavelength (m)
0.714
1.024
Frequnency
512
341.8
Speed of Sound (m/s)
365.50
350.00


Summing Up:
1. What two variable are needed to calculate the speed of sound?
The two variables needed to calculate the speed of sound are the wavelength and frequency.

2. When the sound started to resonate from the tube at a certain spot, how much of a full wavelength did that represent?
When the sound started to resonate, it represents 1/4 of the full wavelength.
3. How did the values for the speed of sound compare with the two different frequencies that you tested?

In my first test, I used a higher frequency tuning fork, so the value for speed of sound was a little bit higher then my second test, where a smaller frequency tuning fork was used.
4. The accepted speed of sound is 332 m/s at 0°C, and increases 0.6 m/s for each Celcius degree above zero. Use a thermometer to find the temperature of the room in
°C. What is the accepted value for the speed of sound in your classroom?
The accepted value for speed of sound in our classroom is 347 m/s.
5. How does your calculation for the speed of sound compare with the accepted value from the last problem?
Our classes value was very close, and very accurate, but since the room was warmer the
0°C it was higher.