Making a wave
All waves carry energy from one place to another. How can you make a wave on a rope? What happens if the wave touches a fixed obstacle? In this activity you will make a wave on a rope and observe its characteristics.
Which physical quantities of wave control when you make a transversal wave on the rope? What happens to the wave if it touches a firm of obstacle?
Making a hypothesis
Make a hypothesis to predict wave behavior on the rope in such a condition.
• Planning an experiment to examine the behavior of a transversal wave behavior on a rope.
• Observing what happens to the transversal wave if it touches a firm obstacle.
What you need
• a plastic rope
• a meter ruler
• a stopwatch
Planning an experiment
1. In a group, discuss and write a hypothesis.
2. Arrange the steps that you will use to examine the hypothesis.
3. Find the equipment or materials you need. Plan a data table.
Checking the plan
1. Two students in your group should sit on the floor, each holding one end of a stretching rope. Decide who will make the wave.
2. The wave maker should move one end of the rope fast to make a transversal wave. What is another way to make a transversal wave?
3. What will you do to change the wave amplitude?
4. How will you move the end of the rope to examine the relations between frequency and wavelength?
5. Make sure that your teacher agrees with your plan and you have put her or his advice in your plan.
Doing the experiment
1. Do the experiment as planned.
2. During the experiment, write the results.
Analysis and application
1. How do you change the wave amplitude? Is the amplitude constantly the same when a wave pulsation is moving through the rope? Explain why it is or is not so.
2. Predict what happens if the wave touched a firm obstacle.
3. Summarize how you can make a wave with a larger frequency. Explain the relation between frequency and wavelength.