GRADE 7 SCIENCE CLASSWORK, TUESDAY 10/7/14
1.Go to Mrs. Manguiat’s schoolnotes LINKS and click on SOUND WAVES 1 and watch the video, “Sound Waves Underwater, the Loch Ness Monster.” As you watch the video, take notes on looseleaf on how sonar technology is being used to see underwater. Pay close attention to how waves are used to do this.
2.When you are done watching the video, click on SUPPORT MATERIALS, read the BACKGROUND ESSAY, and take notes on this information also.
3.Click on DISCUSSION QUESTIONS and answer all of them, using the same looseleaf paper.
4.Answer the following additional question: Explain how each of the properties of waves and interactions of waves are being used in some way to find the Loch Ness Monster:
- Reflection
- Refraction
- Diffraction
- Constructive Interference
- Destructive Interference
5.Reflection Lab: Work with a partner. In this lab, you will investigate wave behavior in producing reflections.
Problem: How do waves interact with objects around them to create a reflection of another object?
Hypothesis:
Materials: coffee filter, drawing of an arrow, beaker, bowl, coin, water
Procedure:
1.Put the drawing of an arrow on the table so that the arrow is pointing to the right.
2.Fill a beaker with water and place it in near the picture, directly in front of the drawing, so that the beaker is between you and the arrow.
3. Bend down and look through the front of the beaker full of water, at the drawing of the arrow. What happened to the arrow? Record your observations using drawings and a description.
4.Turn the drawing of the arrow on the table so that the arrow is now pointing to the left. Then, repeat step 3. What happened to the arrow this time? Record your observations using drawings and a description. Do not throw out the water.
5. Using the coffee filter, line the inside of the plastic bowl.
6. Place a coin on top of the coffee filter, so that the coin is at the center of the bottom of the bowl.
7. Bend down, so that you are looking upward at the bowl, at an angle where you can see the top of the bowl, but you are unable to see the coin sitting at the bottom of the bowl. While you are in this position, have your partner pour the water from the beaker into the bowl. Have your partner continue to pour water into the bowl, until you see the reflection of the coin appear to rise in front of you.
8. What happened? Record your observations using drawings and a description.
9. While you are still in the bent position and can see the reflection of the reflection of the coin, but NOT the actual coin itself, touch the coin’s reflection without actually touching the coin itself. What happened? Record your observations using drawings and a description.
Analyze & Conclude:
1.Compare your results with your hypothesis.
2. Explain what caused your observations in steps #3 and #4 to occur. Why does this happen? (Be sure to mention how light waves are involved.)
3. Explain what caused your observations in steps #8 and #9 to occur. Why does this happen? (Be sure to mention how light waves are involved.)
4. Where in this lab did refraction occur? Explain your answer.
5. What knowledge have you gained from this lab?
6. What is a real world application of the knowledge that you have gained?
Research: How do your eyes and your brain work together to process light waves to create an image? How is this process different in someone who is blind?