Waves and Their Applications - Sound Interactions

Module L: Waves and Their Applications

• This module covers waves and their applications.

Unit 1: Waves

• Focuses on the behavior of waves, particularly sound waves.

Day 1- Lesson 2: Behavior of Waves - Sound Wave Interaction

• Standards:

  • MS-PS4-1: Mathematical models describe waves, including amplitude's relationship to energy.
  • MS-PS4-2: Models explain how waves are reflected, absorbed, or transmitted through materials.

• Objectives:

  • Define absorption, reflection, transmission, and echo.
  • Explain sound reflection.
  • Compare and contrast reflection and transmission.

Vocabularies

• Absorption: The process of a wave losing energy when interacting with a medium.
• Reflection: The bouncing of a wave off a surface.
• Transmission: The passing of a wave through a medium.

Starter (Page 5)

• Question 1: How does sound energy change with distance?
• Question 2: Which dolphins (diagrammed) are likely to hear the sound of a larger dolphin? Why?

Sound Wave Behavior

• Sound waves decrease in loudness as distance from the source increases.

• Absorption, Reflection, and Transmission:

  • Reflection: Sound bouncing off a surface
  • Transmission: Sound passing through a surface
  • Absorption: Sound losing energy when interacting with a surface

Group Work (Page 8)

• Students explore sound transmission, absorption, and reflection.
• Consider scenarios:
  • Sound in an empty room
  • Hearing someone in another room
  • Music recordings in soundproofed rooms

Sound Reflection, Absorption and Transmission (Page 9)

• Reflection: A wave hitting a surface and bouncing off it.
• An echo is a reflected sound wave.
• Hard, smooth surfaces reflect sound better than soft surfaces, which absorb it.

Sound Transmission

• The propagation or speed of a sound wave traveling through a medium/object
• Related to how readily different materials allow sound to move.

Check Your Understanding (Page 10)

• Compare and Contrast: Evaluate and distinguish among absorption, reflection, and transmission.

Activity-Edpuzzle (Page 11)

• Access Edpuzzle website and watch video.
• Complete pop-up questions pertaining to sound reflection, absorption, and transmission.

Day 2- Lesson 2: Behavior of Waves - Sound Wave Interaction (Page 12)

• Standards:

  • MS-PS4-1: Wave amplitude and energy relationship.
  • MS-PS4-2: Waves' interaction (reflection, absorption, transmission) with various materials.

• Starter (Page 13):

  • Describe how sound interacts with a wall.

Objectives (Page 14)

• Describe sound absorption.
• Explain the relationship between sound absorption and frequency.
• Connect absorption and frequency to real-world applications (e.g., animal communication).

Absorption (Page 15)

• Movie theaters and recording studios use materials like carpets, foam, and curtains to absorb sound.

Absorption and Frequency (Page 16)

• Higher-frequency waves lose more energy during absorption than lower-frequency waves.
• The greater the movement of particles, the more energy is lost (to friction).
• High frequency waves move particles more.
• Higher frequency waves lose energy to absorption more.

Think-Pair-Share (Page 17)

• Dolphins use high-frequency waves for locating objects (travel short distances).
• Whales use lower-frequency waves for communication (travel long distances).
• Higher-frequency sound waves are absorbed quicker than lower frequency waves.

What Happens When the Wave Hits the Wall? (Page 18)

• Full Reflection: A wave striking a new medium and reflecting back to the original medium.
• Partial Reflection/Partial Transmission: A wave encountering a boundary (new medium) and having a portion of the energy reflected and transmitted into the new medium.

Checking Understanding (Page 19)

• Question 3:
  • Understand how waves' energy interacts at boundaries.
  • Identify wave energy transmission, reflection, and particle effects at these boundaries.

Energy in Partially Reflected Waves (Page 20)

• When a wave is partially reflected and partially transmitted, the energy is divided.
• Reflected and transmitted waves have less energy than the incoming wave.
• Amplitude variations are influenced by mediating medium.