# Goal: to Use a Standing a Standing Wave to Measure and Investigate the Affect of the Amplitude

Name ______Date ______

Ms. SabbatinoPeriod ______

Lab #15:

Wave Parameters

**Goal: To use a standing a standing wave**to measure and investigate the affect of the **amplitude, frequency, period, and wavelengthon the speedof a transverse wave.**

Background:

Define all terms above in a paragraph.

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Prediction: Circle which of the following you think can be used todetermine the speed of a wave.

-Amplitude

-Frequency

-Period

-Wavelength

Materials:

-ruler

-Stop watches

-slinky

Lab Setup:Draw AND LABEL a standing wave with all the terms below

-crest

-trough

-nodes

-antinodes

-wavelength

-amplitude

Procedure:

- Using a slinky, we will create a standing wave between two people standing 4 meters apart.
- Once person will establish a frequency that will produce a standing wave vibrating at its fundamental frequency with an amplitude of 0.5 meters
- Once the wave is established, the timers will time how long it takes for 15 oscillations. Record the values in the table
- This will be repeated for an amplitude of 1m.
- The frequency will then be changed to produce a standing wave in the 2nd harmonic and steps 3-4 will be repeated.
- Create a wave in the 3rd harmonic and repeat steps 3-4
- Create a wave in the 4th harmonic and repeat steps 3-4

Data: Fill out whatever you need to in the table below INCLUDING UNITS!

Analysis:

Answer the following questions

- If we are trying to determine the speed of the wave, what units should our answer be in?

- Based on the answer to question 1, what two variables above could you use to calculate the speed of this wave?

- Write an appropriate formula for the speed of a wave using the symbols in your reference table.

- There is a second formula that can be used to calculate the speed of a wave that is equally valid. Write that formula below

- Using one of the formulas above, calculate the speed of each wave and enter the values above. Show one sample calculation with units here.

- Look at all the speeds calculated for the amplitude of 0.5m. What is the range of speeds? ______.
- Is that significant difference or can you consider all the speeds the same?

- Look at all the speeds calculated for the amplitude of 1.0m. What is the range of speeds? ______.
- Is that significant difference or can you consider all the speeds the same?

- Are the speeds for the 0.5m amplitude and the 1.0m amplitude the same? ______
- Calculate the percent difference between the average speed of the 0.5m amplitude wave and the 1.0m amplitude wave to prove your statement above.

- Does frequency affect the speed of the wave? ______
- Explain:

- Does wavelength affect the speed of the wave? ______
- Explain:

- Does amplitude affect the speed of the wave? ______
- Explain:

- How do you think you could change the speed of that wave?

Conclusion:

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**Conclusion Self Assessment**

______I restated my goal?

______I stated how frequency affects a wave’s speed

______I stated how period affects a wave’s speed

______I stated how wavelength affects a wave’s speed

______I stated how amplitude affects a wave’s speed

______I hypothesized what could affect a wave’s speed

______I offered at least one source of error

______I came up with a valid future experiment