I was doing an experiment where I explore how the frequency of the oscillation of a vibrating water hose (the end of the water hose), affects the amplitude created by the water path (a wave-like motion is created).
Here are the results:
Frequency (Hz) - Amplitude (cm)
- 5 - 1.93
- 10 - 3.7
- 15 - 4.7
- 20 - 5.5
- 25 - 7.9
- 30 - 8.33 (this is where the amplitude was the greatest)
- 35 - 5.6
- 40 - 2
- 45 - 1.43
- 50 - 0.73
From the results, it was clear that at 30/31 Hz, the amplitude is at its greatest, and then it decrease after it surpasses that certain frequency.
Why is it that at approximately 30 Hz, the amplitude is at its maximum, and why does it decrease back down again? Why does the results (amplitude) go up and back down?
Why doesn't a larger frequency give a larger amplitude?