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#### 1)What does the dropping liquid create?                   Describe what you see as the liquid continues to drop?   Increase and decrease the amplitude setting

###### Physics

1)What does the dropping liquid create?

1. Describe what you see as the liquid continues to drop?

2. Increase and decrease the amplitude setting.  What happens to the actual drops of liquid AND the waves created as you increase and decrease the amplitude?

3. What is amplitude?

4. Increase and decrease the frequency setting.  What happens to the actual drops of liquid AND the waves as you increase and decrease frequency?

5. What is frequency?

1. Using and viewing the wave meter, increase and decrease amplitude.  What happens to the waves on the meter?  Sketch two examples below and label them.

 Using and viewing the wave meter increase and decrease frequency, what happens to the waves on the meter?  Sketch two examples below and label them.

1. The size of the water droplets represents the amount of energy applied to create a wave.   What kind of relationship (direct, inverse) is there between the energy applied and the height of a wave?

2. Think about comparing the wavelength to the frequency.  Go back and change these variables if you need to.  What kind of relationship is there between wavelength and frequency?

3. What would be the mathematical relationship between wavelength and frequency?  Use the abbreviations f  for frequency and   for wavelength.

## Part 2: Sound

Now choose the speaker (sound) the bottom. Set to top view and the multiple waves.  Put Frequency and Amplitude in the middle (just like you did with the water) Choose Play Tone and Waves. Also attach your wave meter and drag one probe into the wave-viewing area. Click on Both Particles and Waves so you can watch how both vary.

1. You can have your sound on - but don’t have it extremely loud.  Push the green button for sound. Explore the sound simulation as you change the amplitude and frequency. Look for patterns and relationships.  Describe something you notice.

2.  Do the particles move in the same direction as the wave or perpendicular to the motion of the wave?

What do we call this kind of a wave?  (transverse or longitudinal?)

1.  Freeze and observe: are the particles closer together or farther apart in the white area of the wave-viewing area?

2. What is the name for this portion of a wave?

3. Are the particles closer together or farther apart in the dark area of the wave-viewing area?

4. What is the name for this portion of a wave?

5. Follow one red dot as the waves cross it.   After a number of waves have crossed it what happens to its net displacement?

6. Do the particles ever move permanently across the field of view?   If the particles are not moving, what is moving?

7. The graph is a graph of kinetic energy.   How would you describe the difference between the energy at a peak and the energy at a trough?

8. Pause your display and then drag the second probe from your wave meter into the wave-viewing area, and have these two probes at different parts of the same compression but of different waves.  Let it play again and describe your results.   Are the wave motions in phase?

9. While the application runs drag one probe until the two waves are precisely out of phase.  Hit pause and describe the parts of the waves that each probe is in.

10. Turn on the sound and change the amplitude.   What do we use in everyday language to describe the amplitude of a sound?

11. Change the frequency while watching the waveforms.  Does changing the frequency change the amplitude?

12. What kinds of sounds do we associate with higher frequencies?  Lower frequencies?

13. Alternate between the top view and the side view while some sound waves are running.   In one word, describe the shape of a sound wave if there are no obstructions.

14. Set your application to run with the two probes in place.  Again, set them so that the two wave peaks are exactly out of phase with each other.  Assume the energy of the wave is zero when the wave hits the center (zero) line, how much net energy is on the graph when the peak of one wave is perfectly aligned with the trough of the other wave?

15. How much energy is there when the two waves are precisely overlapping?

## Part 3: Light

Now choose the laser (light) the bottom. Set to top view and the multiple waves.  Turn the Screen to “on”.

1. Select frequency to a color of your choice and turn up the amplitude fairly high.     It will take a while for the bright waves to hit the screen.   When this happens is the screen bright or dark?

2. Turn the amplitude down to almost zero wait for the waves to hit the screen.  Why does the screen darken?

3. Turn the amplitude totally down for a few seconds and then back up.  What do you get when the amplitude is zero, and why?

4. Let’s look at wavelength and frequency.   Set the frequency to green, run it until the screen is filled, then hit the pause button to freeze it.  Use the tape measure to measure the wavelength.   What is it, and in what units is it measured?

5. Does it matter if you measure from one crest to another crest, or from one trough to another trough?

6. Move the frequency to the deepest red you can get and measure the wavelength. What did you get?

7. The wavelength of the deepest red that humans can see is about 700 nm.  Is this close to what you got?   What would you call an emission that has an invisible wavelength just beyond red?

8. To get a more precise answer, measure the distance across 5 wavelengths and divide that by five.  Is your answer more precise?   Use this method from now on.

9. Now move the frequency to the farthest violet you can get.  What is the wavelength?

10. A typical figure for visible violet is around 280 nanometers.   What would you call the emission that we cannot see that is beyond the violet that we can see?

11. Flip back and forth between top view and side view.  What is the shape of a light emission?

12. The abbreviation for the basic colors of the spectrum is ROYGBIV.  Does this go in order of increasing wavelength or increasing frequency?

Part 4: Summary

Describe what you see (or hear) for each type of wave (the first column is filled in for you).

 High Amplitude Low Amplitude High Frequency Low Frequency Short Wavelength Long Wavelength Water Tall waves Sound Loud Sound Light Bright Light

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