Properties of Sound Lab- Experiment 2

Thicker the Rubber Band	It sounds like a low drum beating constantly.
The thinner the Rubber Band	The pitch of the rubber band increases causing the sound to higher.

Experiment 2- Frequency

Procedure:

·         Have two partners each hold one end of the thicker rubber band and pull until the rubber band is not loose.

·         Pull the rubber band about 2 cm away from starting point, let it go. Observe and describe the sound.

·         Repeat steps 1-2 with the thin rubber band and describe the difference in the chart below.

·         Now, take the thicker rubber band again. Repeat 1-2.

·         Now pull the thicker rubber band a little bit tighter and repeat steps 1-2. Observe how the sound changes.

·         Pull the rubber band even tighter and repeat steps 1-2. Observe how the sound changes.

·         The last experiment. Have two partners hold the thick rubber band just like in step 1. Repeat step 2 and observe the change in sound.

·         Repeat step 8 two more times, make the rubber band shorter every time. Recored the observations every time.

Length of Rubber Band	Description of Sound
Shortest	Higher the pitch, and the softer the sound of the rubber band.
Long	Has a high pitch, higher than the “shortest” rubber band sound. Has a higher sound than the “shortest rubber” band.
Longest	High pitch and the loudest of them all.

Tightness of Rubber Bans	Description of Sound
Tightest	Higher Pitch- but the same sound as the “long rubber band”
Tight	Louder sound, but higher pitch than the “shortest” rubber band.
Loose	Super low, the pitch sounds very low.

 

Conclusion

1.       How did the sound change when you changed the amplitude (how far the rubber band was away from the middle point)?

The pitch of the rubber band increases, when you change the amplitude of the rubber band. When listening to the rubber band is sounds like a beat of a drum, steady but with a tang at the end.

2.       What happened when you changed the thickness, length, and tightness of the rubber band?

·         The thicker the band- the lower the pitch of the sound. Sometimes it is very hard to hear the rubber band because the pitch is so low.

·         The thinner the band, and when you pull the band far away from its original\

3.       Sally is playing the guitar and notices that one of her strings is flat (pitch is too low). What can she do to fix this?

If Sally wants to tune her guitar she has to tighten the string. This will make the guitar have a louder sound and pitch. Sally has to be careful of tightening the string to much, if she does this will make the guitar sound awfully high.