Pre-Lab
Explore https://phet.colorado.edu/sims/html/wave-on-a-string/latest/wave-on-a-string_en.html
Post your questions or findings through https://docs.google.com/forms/d/e/1FAIpQLSerE8kZX8n3vkyxwGcUD4jxvX-0jKDqwnx3cskKi8WEu6bw5A/viewform?usp=sf_link
Lab Objective
Measure the properties of the wave and find the relationships
Lab Setup
Initial Setup:
- Go to https://phet.colorado.edu/sims/html/wave-on-a-string/latest/wave-on-a-string_en.html
- Select Oscillate, No End, Slow Motion in the simulator
- Set Amplitude to 0.50cm, Frequency to 1.5Hz, Damping to None, Tension to High
- Check Rulers, Timer, and Reference Line
Data to collect
- the maximum displacement(the distance between the peak and the orange line) a particle oscillates from the center(Hint: pause the wave and move the reference line to the peak of the wave)
- the time one green particle finish a complete oscillation(Hint: recall in the previous lab, we measured 10 circles and divide the total time by 10 to make it more precise)
Lab Measurement and Data Collection
Experiment #1 How will the wave change if the amplitude change?
| Column | A | B | C | D | E |
| # of Trial | Amplitude (unit:cm) | __________ the maximum displacement (Unit:cm) | Frequency(Unit:Hz) | The time one green particle finish 10 complete oscillation (Unit:sec) | ___________ The average time one green particl finish 1 complete oscillation |
| 1 | 0.25 | 1.50 | |||
| 2 | 0.50 | 1.50 | |||
| 3 | 0.75 | 1.50 | |||
| 4 | 1.00 | 1.50 | |||
| 5 | 1.25 | 1.50 |
Experiment #2 How will the wave change if the Frequency change?
| Column | A | C | D | E | F |
| # of Trial | Amplitude (unit:cm) | Frequency(Unit:Hz) | The time one green particle finish 10 complete oscillation (Unit:sec) | ___________ The average time one green particl finish 1 complete oscillation | __________ C x F |
| 1 | 0.50 | 1.00 | |||
| 2 | 0.50 | 1.25 | |||
| 3 | 0.50 | 1.50 | |||
| 4 | 0.50 | 1.75 | |||
| 5 | 0.50 | 2.00 |
Explanation
Concepts
| Definition | Symbol | Unit | Formula | |
| Amplitude | the distance between a line through the middle of a wave and a crest or trough. | A | m | N/A |
| Frequency | how many waves pass a point in a certain amount of time | f | Hz, s-1 | f =1/T |
| Period | the amount of time for the wave to repeat itself | T | s | T= 1/f |
| Wavelength | the distance from the crest on one wave to the crest on the very next wave | λ | m | λ = v/f = vT |
| Speed | the distance a wave travels in an amount of time | v | m/s | v = λf = λ/T |