Week 5 - Sound Interaction (Transmission, Reflection, Absorption) PDF

MODULE L: WAVES AND THEIR APPLICATIONS UNIT 1: Waves DAY 1- LESSON 2: BEHAVIOR OF WAVES- SOUND WAVE INTERACTION ► MS-PS4-1 Use mathematical representations to describe a simple model for waves that includes how the amplitude...

MODULE L: WAVES AND THEIR APPLICATIONS UNIT 1: Waves DAY 1- LESSON 2: BEHAVIOR OF WAVES- SOUND WAVE INTERACTION ► MS-PS4-1 Use mathematical representations to describe a simple model for waves that includes how the amplitude of waves is related to the energy in a wave ► Standards: ► MS-PS4-2 Develop and use a model to describe that waves are reflected, absorbed, or transmitted through various materials ► Objectives ∙ Identify the meaning of Absorption, reflection, transmission ∙ Define echo ∙ Explain how sound is reflected ∙ Compare and contrast reflection and transmission  ► Absorption ▶ VOCABULARIES ► Reflection ► Transmission STARTER Question: ▶ What can you say about the energy of the sound as distance Increase? ▶ Which small dolphin will hear the sound of the big dolphin and which one possibly can not hear the big dolphin? explain ▶ Asthe distance from the source of the sound decreases, the loudness of the sound increases Sound waves behaves in 3 different ways:  GROUP WORK- INQUIRY-BASED LEARNING - Search the meaning of Sound transmission, absorption and reflection. - Consider the following questions while searching ▶ What will happen to your sound if you shout in an empty room ? ▶ Why do you think that your brother in another room (closed) can hear you when you call his name? ▶ Why do you think that singers record their songs in a room with walls covered with foams? ▶ Sound reflection, absorption and transmission ▶ Reflection occurs when a wave strikes an object or surface and bounces off. ▶ An echo is reflected sound. ▶ Your echo bounces off the walls, floor, ceiling, furniture, and people. ▶ A hard, smooth surface (cardboard) reflects sound better than an uneven, soft surface (pillow). This is because the soft surface absorbs most of the sound ▶ Sound transmission -the PROPAGATION or spead of a SOUND WAVE through an object or medium, CHECK YOUR UNDERSTANDING Compare and contrast absorption, reflection and transmission ▶ Label: Transmission - Reflection – Absorption B A C ACTIVITY- EDPUZZLE SOUND ABSORPTION, REFLECTION, AND TRANSMISSION ▶ Click the link below to access the Edpuzzle website and watch a video on sound reflection, absorption and transmission and at the same time answer the pop-up questions ▶ https://edpuzzle.com/assignments/66f0f112b78b80e339c16120/watch DAY 2- LESSON 2: BEHAVIOR OF WAVES- SOUND WAVE INTERACTION ABSORPTION AND FREQUENCY ► MS-PS4-1 Use mathematical representations to describe a simple model for waves that includes how the amplitude of waves is related to the energy in a wave ► Standards: ► MS-PS4-2 Develop and use a model to describe that waves are reflected, absorbed, or transmitted through various materials STARTER Describe what happens in this picture. What happened to the sound as it tries to pass through the wall? explain ▶ Describe how sound is absorbed ▶ Explain how the absorption of sound is related to the frequency of the sound ▶ Apply your knowledge of absorption and frequency of wave in real life (dolphin and whale communication in longer and shorted distance) OBJECTIVES  Absorption ▶ Why are movie theaters and recording studios often designed with soft materials like carpets, foam panels, and curtains on the walls?  Absorption and Frequency ▶ Absorption can vary based on the frequency of the wave. ▶ Generally, a high frequency wave will lose more energy to absorption than a low frequency wave. ▶ The more a particle is moved, the more energy it loses to friction. ▶ High-frequency waves move a medium’s particle more often. ▶ The higher the frequency of the wave, the more energy it will lose to absorption. Think-Pair-Share ▶ Whales and dolphins both use sound underwater. Dolphins use high frequency wave to locate objects. These waves can travel a few hundred meters. Whales use low frequency sound waves to communicate. These waves can travel hundreds of kilometers. ▶ Why might these sounds travel different distance? ANSWER: THE HIGHER FREQUENCY SOUNDS ARE ABSORBED FASTER THAN LOWER FREQUENCY. WHAT HAPPENS WHEN THE WAVE HIT THE WALL? The wave struck the new medium and reflects into the rope. (full reflection) WHAT HAPPENS WHEN THE WAVE HIT THE BOUNDARY? The wave is partly reflected and partly transmitted into the new medium. CHECKING UNDERSTANDING ▶ When a mechanical wave is partially reflected and partially transmitted, the original wave becomes two waves. The energy from the original wave is split between the transmitted wave and the reflected wave. Because the original wave’s energy is split between the two new waves, each of the new waves will have less energy than the original wave. Amplitude depends on the medium, so the transmitted and reflected waves’ amplitudes could be very different. ENERGY IN PARTIALLY REFLECTED WAVES.