UNIT 9 MASTERY Wave Behavior: Reflection, Refraction, Diffraction, and the Doppler Effect TSW E09.06 I can differentiate between reflection, refraction, and diffraction and how these affect waves. TSW E09.07 I can describe the property of sound waves and explain how the Doppler effect works. TSW E09.08 I can analyze the functions of the three main regions of the human ear. Introduction In the previous lesson we learned how to describe a wave, compare them, and also learn some of their characteristics/properties. We learned that waves are really good at moving energy from one place to another and that we can change a wave by changing its frequency, wavelength, wave speed and/or amplitude. But there are also very interesting ways waves can behave! Just like with forces, we can use waves to add up energy or cancel out energy. We can also make waves bounce off things! We can also make waves bend and change direction, either by changing the “medium” and we can change how a wave will spread out by changing the size of the opening it’s going through. Finally, by moving what is making a sound wave, we can change the pitch. Remember that light and sound are the most common waves we see in everyday life. Instructions for Graphic Organizer Your task is to watch the video and read the article to finish the graphic organizer below. Some of the sections have already been done for you. 1. The definition needs to be in your own words . You must paraphrase this to demonstrate understanding. 2. The diagram/sketch is a simple drawing of how the behavior works. You will probably use arrows and stick figures in this section. 3. In the application section, you are going to explain how this wave behavior is demonstrated in at least 2 real life situations. Suggested Resources (You may use Other Sources if you Cite them) ● Video #1 Describing Reflection, Refraction and Diffraction with PPT: https://www.youtube.com/watch?v=bG2dLT5-WkE ● Article #1 Demonstrating Wave Behavior with Water Waves: https://www.sciencelearn.org.nz/resources/121-behaviour-of-waves ● Video #2 Explaining the Doppler Effect: ● Article #2 Describing Doppler Effect with Illustrations: Wave Behavior Interference ____________ https://www.youtube.com/watch?v=h4OnBYrbCj S1 Personal Definition Interference is when 2 waves overlap to add together their amplitudes (constructive) or cancel each other out their amplitudes (destructive) depending on how they are lined up. Y https://kids.kiddle.co/Doppler_effec t Diagram/Sketch 2 Application/Real Life Situation ● ● ● Noise Cancelling Headphones for Sound Waves Soapy Bubble Rainbows Lots of voices in a crowd blending together to sound like one big loud voice ● Rainbows ● Lenses for Reading Glasses ● Bending of Water through Refraction ____________ When a wave approaches a boundary, it bends around the boundary. In other words, if there is an opening, it opens around each edge, spreading the wave out like the picture shown in the diagram. Doppler Effect PART B: DOPPLER EFFECT Consider your observations during the mini doppler effect demonstration, use a diagram to explain how the Doppler effect works. How does sound travel in relation to position and the human ear PART C: SOUND WAVES AND THE HUMAN EAR A sound wave is a vibration of air that our ear interprets as a recognizable noise. There are three main regions of the human ear are designed to interpret sound waves. Make a simple drawing of the human ear, highlighting these three main regions, analyze their functions and how the interpret sound. Make sure that your diagram is well labelled.
