Sound Wave Interference
Princess Mhay P. CuritanaBSCIEPHY III-24
Index
1. Introduction
8. Assessment Check Point 3
2. Objectives
9. Sound Traveling Between Materials
3. Experiment
10. Sound & Reflraction
4. Assessment Check Point 1
11. Critical Angle
12. Angle of Refraction
5. Wave Interference
13. Review
6. Dead spots
14. References
7. Assessment Check Point 2
INTRODUCTIONTotal internal reflection is an optical phenomenon where a wave completely reflects at the boundary between two different mediums, such as from a denser to a less dense medium when the angle of incidence exceeds the critical angle. This optical effect occurs when light encounters a medium with a lower refractive index, causing it to be reflected into the denser medium. This principle is crucial in optical devices like fiber optics, prisms, and lenses, used in applications like telecommunications and medical imaging.
OBJECTIVES:
- Explain what can happen to the energy of sound waves when the waves interact.
- Compare and contrast constructive interference and destructive interference.
- Explain what a critical angle is.
In this experiment, there are two speakers next to each other and both are simultaneously playing a certain wave pattern. The very bottom wave is the sum of the other two waves.
The very bottom wave is produced by in two phase sound waves.
Sound waves from different sources interact to create a new wave, known as interference. Constructive interference occurs when compressions and rarefactions align, resulting in a higher-intensity wave. Destructive interference occurs when compressions and rarefactions are out of phase, creating a dampened wave. When waves interfere destructively, the sound becomes louder in some places and softer in others, causing pulses or beats.
Dead spots are areas where no sound can be heard due to destructive wave interference. Engineers designing theaters or auditoriums must consider this issue, choosing the shape and materials based on interference patterns to ensure that every audience member can hear loud, clear sounds. Dead spots occur when compressions of one wave cancel with rarefactions from another.
Sound Traveling Between Materials
Refraction is caused by sound entering the new medium at an angle. Because of the angle, part of the wave enters the new medium first and changes speed. The difference in speeds causes the wave to bend.
Remember that sound travels faster in some materials than others. Sound waves travel outward in straight lines from their source until something interferes with their path. When sound changes mediums, or enters a different material, it is bent from its original direction. This change in angle of direction is called refraction.
Critical Angle
The angle of refraction is a crucial aspect of sound transmission, determining the direction of sound waves in a medium. It is determined when a wave enters a new medium, and as the angle from the wave to the barrier decreases, the angle of refraction also gets closer to the barrier. When the wave's entering angle reaches the critical angle, the refraction is parallel to the dividing line between the mediums. The critical angle depends on the speed of sound, with a greater difference in speed resulting in a greater critical angle.
Sound hits a new medium with an angle smaller than its critical angle, causing it to bounce off or be reflected from the dividing line. When a wave is reflected, it returns with an angle equal to the one it hit. When sound hits a new medium, part of it is reflected back, while the rest enters and is refracted. For example, a sound traveling through the air and hitting a brick building's wall will be reflected, but much of it enters the brick due to the faster speed of the brick's molecules. If the wave hits the building with an angle smaller than its critical angle, it cannot enter the brick and is reflected. The reflected angle would be 165 degrees, 15 degrees measured from the other direction.
Constructive interference is when the compressions and the rarefactions of the two waves line up and strengthen each other to create a wave with a higher intensity.
Review:
Wave interaction is called interference.
Refraction is caused by sound entering the new medium at an angle.
References:
Physics of Nondestructive Evaluation. (n.d.). IOWA STATE UNIVERSITY - Center for Nondestructive Evaluation . https://www.nde-ed.org/Physics/index.xhtmlhttps://www.vedantu.com/question-sets/155e1269-e5f1-4547-8580-18435518a2373609501779867765845.png
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Sound Wave Interference
PRINCESS MHAY CURITANA
Created on December 26, 2023
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Transcript
Sound Wave Interference
Princess Mhay P. CuritanaBSCIEPHY III-24
Index
1. Introduction
8. Assessment Check Point 3
2. Objectives
9. Sound Traveling Between Materials
3. Experiment
10. Sound & Reflraction
4. Assessment Check Point 1
11. Critical Angle
12. Angle of Refraction
5. Wave Interference
13. Review
6. Dead spots
14. References
7. Assessment Check Point 2
INTRODUCTIONTotal internal reflection is an optical phenomenon where a wave completely reflects at the boundary between two different mediums, such as from a denser to a less dense medium when the angle of incidence exceeds the critical angle. This optical effect occurs when light encounters a medium with a lower refractive index, causing it to be reflected into the denser medium. This principle is crucial in optical devices like fiber optics, prisms, and lenses, used in applications like telecommunications and medical imaging.
OBJECTIVES:
In this experiment, there are two speakers next to each other and both are simultaneously playing a certain wave pattern. The very bottom wave is the sum of the other two waves. The very bottom wave is produced by in two phase sound waves.
Sound waves from different sources interact to create a new wave, known as interference. Constructive interference occurs when compressions and rarefactions align, resulting in a higher-intensity wave. Destructive interference occurs when compressions and rarefactions are out of phase, creating a dampened wave. When waves interfere destructively, the sound becomes louder in some places and softer in others, causing pulses or beats.
Dead spots are areas where no sound can be heard due to destructive wave interference. Engineers designing theaters or auditoriums must consider this issue, choosing the shape and materials based on interference patterns to ensure that every audience member can hear loud, clear sounds. Dead spots occur when compressions of one wave cancel with rarefactions from another.
Sound Traveling Between Materials
Refraction is caused by sound entering the new medium at an angle. Because of the angle, part of the wave enters the new medium first and changes speed. The difference in speeds causes the wave to bend.
Remember that sound travels faster in some materials than others. Sound waves travel outward in straight lines from their source until something interferes with their path. When sound changes mediums, or enters a different material, it is bent from its original direction. This change in angle of direction is called refraction.
Critical Angle
The angle of refraction is a crucial aspect of sound transmission, determining the direction of sound waves in a medium. It is determined when a wave enters a new medium, and as the angle from the wave to the barrier decreases, the angle of refraction also gets closer to the barrier. When the wave's entering angle reaches the critical angle, the refraction is parallel to the dividing line between the mediums. The critical angle depends on the speed of sound, with a greater difference in speed resulting in a greater critical angle.
Sound hits a new medium with an angle smaller than its critical angle, causing it to bounce off or be reflected from the dividing line. When a wave is reflected, it returns with an angle equal to the one it hit. When sound hits a new medium, part of it is reflected back, while the rest enters and is refracted. For example, a sound traveling through the air and hitting a brick building's wall will be reflected, but much of it enters the brick due to the faster speed of the brick's molecules. If the wave hits the building with an angle smaller than its critical angle, it cannot enter the brick and is reflected. The reflected angle would be 165 degrees, 15 degrees measured from the other direction.
Constructive interference is when the compressions and the rarefactions of the two waves line up and strengthen each other to create a wave with a higher intensity.
Review:
Wave interaction is called interference.
Refraction is caused by sound entering the new medium at an angle.
References:
Physics of Nondestructive Evaluation. (n.d.). IOWA STATE UNIVERSITY - Center for Nondestructive Evaluation . https://www.nde-ed.org/Physics/index.xhtmlhttps://www.vedantu.com/question-sets/155e1269-e5f1-4547-8580-18435518a2373609501779867765845.png
Thank you!
Got an idea?
Let the communication flow!
With Genially templates, you can include visual resources to wow your audience. You can also highlight a particular sentence or piece of information so that it sticks in your audience’s minds, or even embed external content to surprise them: Whatever you like! Do you need more reasons to create dynamic content? No problem! 90% of the information we assimilate is received through sight and, what’s more, we retain 42% more information when the content moves.
Got an idea?
Let the communication flow!
With Genially templates, you can include visual resources to wow your audience. You can also highlight a particular sentence or piece of information so that it sticks in your audience’s minds, or even embed external content to surprise them: Whatever you like! Do you need more reasons to create dynamic content? No problem! 90% of the information we assimilate is received through sight and, what’s more, we retain 42% more information when the content moves.
Got an idea?
Let the communication flow!
With Genially templates, you can include visual resources to wow your audience. You can also highlight a particular sentence or piece of information so that it sticks in your audience’s minds, or even embed external content to surprise them: Whatever you like! Do you need more reasons to create dynamic content? No problem! 90% of the information we assimilate is received through sight and, what’s more, we retain 42% more information when the content moves.