MR. HAFNER



Name: _____________________________ Period:_________Waves On a StringUsing the following simulation, you will investigate the basic properties of waves. You will see how changing one characteristic can have an effect on other characteristics. Part 1: Pre LabBefore getting a computer label the following diagram based off the following definitions. Crest: The highest point of a waveTrough: The lowest point of a waveAmplitude: The distance from equilibrium/rest position to the crest of the waveWavelength: The distance from one crest to the next crest Part 2: The Simulation Go to the following simulation: the simulation and complete the following before beginning the questions. Wiggle the wrench and see what happens Adjust damping and see what happensSet to “Loose End" and see what happens Set to “No End” and see what happensSet to “Oscillate” Adjust amplitude and frequency Set to “Pulse”Adjust amplitude and pulse widthAdjust tension What happens to the wave when you turn the damping up to a high setting? Summarize in at least one FULL SENTENCE one other change that occurred when you changed a different setting in the simulation?When a wave passes through a medium, in what direction does the waves energy travel?________________________________________When a wave passes through a medium, in what direction does a particle in the medium travel ____________________and____________________What is a pulse? Part 3: ExperimentMake sure that the settings are correct. You are going to click “Oscillate” and “No End” If you have set it up correctly, your screen should look like this Press the restart button. Measure the Amplitude: Hit the pause button and then use the “step” button until the first green ball is at its highest point. Use the vertical ruler to measure the distance from the rest position to the middle of the first green ball. Amplitude = ____________cm ____________mMeasuring Wavelength: With the simulation still paused, use the horizontal ruler to measure the distance from the middle of the first green ball (the first crest) to the next crest. Wavelength = ____________cm ____________mMeasuring Wave Speed: With the simulation still paused, reset the timer and then press the start button on the timer. Use the step button to advance the simulation until the timer reads “1.00 s”. Measure the horizontal distance the wave has travelled in that time. Wave Speed = ____________cm/s ____________m/sMeasuring Frequency: With the simulation still paused, use the step button until the first green ball is at its highest point. Reset the timer and then press the “Start” button on the timer. Use the step button to advance the simulation until the first green ball returns to its crest position 5 TIMES. Observe the time on the timer. Time = ____________sDivide the number of waves that passed (5) by the amount of the time on the timer to get the frequency in waves per second.Wave Frequency = ____________ waves/second (or _______)Part 4: Speed of the Wave (Amplitude & Wavelength)In this section, you will see what the effect of amplitude on wavelength and wave speed. Use the following constants: Frequency = 50Damping = 0 Tension = High Make the measurements necessary to fill in the following data table: Amplitude SettingAmplitude WavelengthWave Speed20cmmcmmm/s30cmmcmmm/s40cmmcmmm/s50cmmcmmm/sShow work for one wave speed below: Part 3: Speed of the Wave (Frequency & Wavelength)Use the following constants: Amplitude = 50 Damping = 0 Tension = High Make the measurements necessary to fill in the following data table:Frequency SettingFrequency (waves/second)WavelengthWave Speed20Hzcmmm/s30Hzcmmm/s40Hzcmmm/s50Hzcmmm/sShow work for one wave speed below: Part 4: Speed of the Wave (Tension & Wavelength) Use the following constants: Amplitude = 20 Damping = 0Frequency = 20 Make the measurements necessary to fill in the following data table:Tension SettingFrequency (waves/second)WavelengthWave Speed7Hzcmmm/s8Hzcmmm/s9Hzcmmm/s10Hzcmmm/sShow work for one wave speed below: Part 5: Finding PeriodChange the wavelength 5 times and calculate the period. Wavelength(cm m)Period (s)Show work for one period below: Part 6: Conclusion Questions What effect does wave amplitude have on wavelength? What effect does wave amplitude have on wave speed? What effect does frequency have on wavelength? What effect does wave frequency have on wave speed? What effect does tension have on wavelength?What effect does tension have on wave speed? Write at least a two-sentence conclusion. (One on what you learned and one for what you found to effect speed of a wave). ................
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