Understanding Sound Environment Quiz - AED122
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Questions and Answers

Which of the following is an example of airborne sound?

  • Footsteps on a floor
  • Furniture moving
  • Hammering
  • Speech (correct)

Impact sound can include noises created by footsteps or dropping objects.

True (A)

What is flanking transmission in acoustics?

Flanking transmission is the indirect transmission of sound from one space to another through adjoining parts of the structure.

Noise is considered to be unwanted _____ that has a clearly negative connotation.

<p>sound</p> Signup and view all the answers

Match the following sound types with their definitions:

<p>Airborne Sound = Produced by vibrating air Impact Sound = Produced by direct physical excitation Flanking Transmission = Indirect sound transfer through structure Noise = Unwanted sound with negative connotation</p> Signup and view all the answers

What term is often used to refer to an unwanted sound?

<p>Noise (B)</p> Signup and view all the answers

Sound is a movement of energy that cannot be transmitted through gas.

<p>False (B)</p> Signup and view all the answers

What can elevated sound levels cause in people?

<p>Hearing impairment, hypertension, sleep disturbance, and decreased performance.</p> Signup and view all the answers

The scientific study of the propagation, absorption, and reflection of sound waves is known as ______.

<p>acoustics</p> Signup and view all the answers

Match the following effects of noise with their outcomes:

<p>Hearing impairment = Loss of hearing ability Hypertension = Increased blood pressure Sleep disturbance = Disruption of sleep patterns Decreased performance = Lowered efficiency in tasks</p> Signup and view all the answers

Which of the following is a common effect of noise on quality of life?

<p>Interference with significant sounds (B)</p> Signup and view all the answers

Noise issues are typically given high priority in urban environment policies.

<p>False (B)</p> Signup and view all the answers

What type of behaviors can elevated sound levels stimulate?

<p>Aggression and anti-social behaviors.</p> Signup and view all the answers

What makes it difficult to take coherent action against noise pollution?

<p>Large number of noise sources (B)</p> Signup and view all the answers

Permanent sources of noise have a more significant impact than temporary noise sources.

<p>True (A)</p> Signup and view all the answers

What is the frequency range of human hearing?

<p>20 Hz to 20,000 Hz</p> Signup and view all the answers

Sources of sound from outside buildings, such as traffic and weather, are known as __________.

<p>external sounds/noises</p> Signup and view all the answers

Which aspect of sound environment study focuses on reducing noise levels in and around buildings?

<p>Noise control (A)</p> Signup and view all the answers

Match the following sound sources with their type:

<p>Traffic noise = External sound Occupants talking = Internal sound Airplane flying = External sound HVAC system = Internal sound</p> Signup and view all the answers

Dogs can perceive sounds at frequencies lower than 20 kHz.

<p>False (B)</p> Signup and view all the answers

What challenges does urbanization pose in relation to noise pollution?

<p>Increasingly powerful noise sources, spreading over larger areas, and increased demand for quieter environments.</p> Signup and view all the answers

Flashcards

Acoustics

The study of how sound waves travel, are absorbed, and bounce off surfaces.

Noise

Unwanted sound that disturbs or annoys people.

Noise Pollution

Unwanted sound that can cause problems for people, including hearing loss, stress, and sleep problems.

Sound Environment

The study of sound and its effects on people and the built environment.

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Sound Level

A measure of how loud a sound is, usually measured in decibels.

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Sound Absorption

The ability of materials to absorb sound waves, reducing noise levels.

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Sound Reflection

The reflection of sound waves off surfaces, influencing how sound travels in a space.

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Negative Effects of Noise

The undesirable effects of sound on people and the built environment, including hearing loss, stress, and sleep disturbances.

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External Noise

The sound produced by sources outside of buildings, such as traffic, aircraft, or construction.

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Internal Noise

The sound created within buildings from various sources like occupants, HVAC systems, or appliances.

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Noise Control

The study of how to reduce noise levels in and around buildings, aiming to create a quieter environment.

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Room Acoustics

The branch of acoustics that focuses on designing spaces with desirable sound characteristics.

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Human Hearing Range

The perception of sound by humans, which is limited to a specific range of frequencies.

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Good Sound Environment

A sonic environment that is free from unwanted sound and provides suitable conditions for its occupants.

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Airborne sound

Sound that travels through the air, caused by vibrations that propagate through the air molecules.

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Impact sound

Sound that is produced by the direct impact of an object onto a surface, causing vibrations that transmit through the structure.

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Flanking Transmission

Sound that travels through a building's structure, bypassing traditional sound barriers like walls and floors.

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Airborne sound insulation

Materials used to reduce the transmission of airborne sound through walls or floors, acting as a barrier to sound waves.

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Impact sound insulation

Materials or techniques employed to reduce the transmission of impact sound through floors, minimizing vibrations and noise.

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Study Notes

Course Information

  • Course Title: Understanding Sound Environment
  • Course Code: AED122
  • Instructor: Dilshan R. Ossen, Ph.D.
  • Associate Professor

Lesson Scope

  • Sound and Noise in Built Environments
  • Principles of Sound
  • Measurement of Sound
  • Material Properties

Sound & Noise in Built Environment

  • Sound environment is a crucial physical element in buildings.
  • People are exposed to sound daily and use sound to communicate.
  • Interpretation of sound is subjective (likes and dislikes vary).

Sound and Noise Definitions

  • Sound: Movement of energy caused by vibrations (solid, liquid, gas) detectable by ears.
  • Noise: Unwanted sound. In science/engineering, noise is an undesirable signal that obscures a desired signal.
  • Acoustics: The scientific study of sound wave propagation, absorption, and reflection.

Noise Pollution

Effects of Unwanted Sound

  • Hearing impairment
  • Hypertension
  • Ischemic heart disease
  • Annoyance
  • Sleep disturbances
  • Reduced performance
  • Stress
  • Increased workplace accidents
  • Aggression and anti-social behaviours
  • Reduced quality of life (unpleasant, undesirable environments).

Noise Pollution Effects (continued)

  • Permanent hearing loss
  • High blood pressure
  • Insomnia
  • Labored breathing
  • Stress
  • Altered brain chemistry
  • Increase in crime
  • Permanent damage to the voice

Other Effects of Noise

  • Interference: Disruption of significant sounds like speech or music, often causing annoyance and danger.
  • Distraction: Disruption of tasks, leading to inefficiency
  • Economic impact: Costs of controlling excessive noise.

Low Policy Priority For Noise

  • Limited knowledge about noise exposure.
  • Limited measurement of noise compared to other pollution.
  • Many noise sources, making coherent action difficult.
  • Lack of training.
  • Absence of major noise-related accidents
  • Temporary nature of noise.

Future Challenges

  • Increasing urbanization, tech advancements, and population growth will intensify noise sources.
  • Noise sources will expand to more diverse areas (urban, rural, leisure).
  • Noise will be present more consistently throughout the day and weekend.
  • Public demand for quieter environments will rise.

Good Sound Environment

  • Protect from unwanted sound (noise).
  • Create suitable sonic conditions for occupants.

Perception of Sound

  • Hearing is crucial for survival in animals.
  • Humans have limited hearing frequencies (20 Hz to 20,000 Hz).
  • Other species hear a wider range of frequencies.
  • Sound is a primary sense for detection of danger, navigation, predation, and communication.

Sound Levels (Decibels)

  • Graduated scale of sound levels (decibels).
  • Examples given of sound levels and corresponding sources (fireworks, jackhammers, traffic, etc).
  • Thresholds range from quietest (breathing) to loudest (e.g., fireworks).

Sound Sources in Built Environments

  • Classified as external or internal
  • External: Traffic, commercial centers, aircraft, railroads, weather, playgrounds, workshops.
  • Internal: Occupants, building services, HVAC, machinery.

Sound Transmission Types

  • Airborne sound: Sound from vibrating objects (speech, TVs).
  • Impact sound: Sound from physical impact (footfalls, hammering).
  • Flanking transmission: Sound transmission through surrounding structural elements/walls.

Sound Environment Study Approach

  • "Noise control": Reduce noise levels in/around buildings.
  • “Room acoustics”: Create suitable sound conditions in enclosed spaces (music halls, auditoriums).

Fundamental Acoustics Concepts

  • Cause: The origin of sound
  • Sound generation mechanism (transduction): Process converting energy into audio
  • Acoustic wave propagation: How sound waves move
  • Reception/transduction: Translating sound waves into another form (e.g., neural impulse)
  • Effect: Response/impact of the sound

Interaction of Sound with a Medium

  • Sound interacts with a medium by reflection, absorption, and transmission.

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Related Documents

AED122 Lesson 5: Understanding Sound Environment PDF

Description

This quiz explores the key concepts of sound and noise in built environments as covered in the course AED122. It assesses your understanding of sound principles, measurement techniques, and the impact of noise pollution on daily life. Test your knowledge and discover how acoustic properties influence our interactions with our surroundings.

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