![]() It can be seen that this causes the wave to bend. Therefore, when the wave encounters the interface between these two materials, the portion of the wave in the second material is moving faster than the portion of the wave in the first material. In the animation below, a series of plane waves are shown traveling in one material and entering a second material that has a higher acoustic velocity. ![]() The velocity of sound in each material is determined by the material properties (elastic modulus and density) for that material. The difference in speeds causes the wave to bend. Because of the angle, part of the wave enters the new medium first and changes speed. This change in angle of direction is called refraction. Show reflection of ripples at a straight barrier. When sound changes mediums (enters a different material) at an angle other that 90 degrees, it is bent from its original direction. Discussion: Refractive index and Snell’s law (20 minutes) Worked example: Using refractive index (10 minutes) Student questions: Calculations involving refractive index (30 minutes) Discussion: Summary (10 minutes) Discussion and demonstrations: Reflection and refraction with ripple tank. Sound waves travel outward in straight lines from their source until something interferes with their path. As a wave radiates from an antenna, it broadens and disperses. Remember that sound travels faster in some materials than others. Reflection When a wave hits a smooth object that is larger than the wave itself, depending on the media, the wave may bounce in another direction. In this video, I define and explain the difference between reflection, refraction, and. Sound Cancellation M t+ The sound from two speakers destructively interferes. Campus Location: Science Center B-08A Tel: (617) 495-5824 Email:. In that unit, it was mentioned that there are two types of. In Unit 10 of The Physics Classroom, the boundary behavior of a pulse on a rope was discussed. Reflection When a wave hits a smooth object that is larger than the wave itself, depending on the media, the wave may bounce in another direction. Later in Lesson 3, diffraction, transmission, and refraction will be discussed in more detail. Try this with multiple material pairs and observe what happens. Waves such as light and sound waves can bend, slow down, and speed up. Mailing Address: Lecture Demonstration Services, Science Center, Rm B-08A, 1 Oxford Street, Cambridge, MA 02138. In this part of Lesson 3, the focus will be upon the reflection behavior of sound waves. ![]() Set the angle of Material 1 to 90 degrees. Refraction of light at the interface between two media of different refractive indices, with n 2 > n 1.Since the velocity is lower in the second medium (v 2 < v 1), the angle of refraction 2 is less than the angle of incidence 1 that is, the ray in the higher-index medium is closer to the normal. Set Materials 1 and 2 to different values.
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