ACOUSTICS

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• Q1: Define Acoustics.
  Ans: Acoustics is the science of sound, including its production, transmission, and effects in a space.
• Q2: State the principals of sound.
  Ans: The principals of sound are as follows:

  • ➔ Sound is produced by vibrating bodies.
  • ➔ Sound requires a medium (air, water, or solid) to travel.
  • ➔ Sound travels in waves.
  • ➔ Sound can be reflected, absorbed, or transmitted.
• Q3: Define Sound.
  Ans: Sound is a form of energy that is produced by vibrating bodies and is perceived by the ear.
• Q4: How does the ear help in hearing a sound?
  Ans: The ear detects vibrations in the air and converts them into electrical signals that the brain interprets as sound.
• Q5: Define a Vibrating body.
  Ans: A vibrating body is an object that moves back and forth rapidly to produce sound.
• Q6: Define Acoustics of Sound.
  Ans: Acoustics of sound is the study of how sound behaves in different environments, including reflection, absorption, and transmission.
• Q7: Define Velocity of Sound.
  Ans: Velocity of sound is the speed at which sound waves travel through a medium.
• Q8: Define Intensity of Sound.
  Ans: Intensity of sound is the amount of sound energy passing through a unit area per second.
• Q9: Define Frequency of Sound.
  Ans: Frequency of sound is the number of vibrations or cycles per second, measured in hertz (Hz).
• Q10: Define Reverberation.
  Ans: Reverberation is the continued sound in a room caused by echoes bouncing off walls after the original sound stops.
• Q11: Define Echo.
  Ans: Echo is the reflection of sound that is heard distinctly after the original sound.
• Q12: Write two methods of transmission of sound.
  Ans: The two methods of transmission of sound are:

  • ➔ Air borne sound
  • ➔ Structure borne sound
• Q13: Define Air Borne Sound.
  Ans: Air borne sound is sound that travels through the air from a source to a listener.
• Q14: Define Structure Borne Sound.
  Ans: Structure borne sound is sound that travels through solid materials like walls, floors, or ceilings.
• Q15: Define Sound Absorbing materials.
  Ans: Sound absorbing materials are materials that reduce the reflection and reverberation of sound in a space.
• Q16: Name 4 Sound Absorbing materials.
  Ans: Following are some of the sound absorbing materials:

  • ➔ Wool
  • ➔ Cork
  • ➔ Acoustic foam
  • ➔ Fibreglass
• Q17: Write 4 properties of Sound Absorbing materials.
  Ans: Some of the properties of sound absorbing materials are as follows:

  • ➔ Porous and soft
  • ➔ Lightweight
  • ➔ High absorption coefficient
  • ➔ Reduces echoes and reverberation
• Q18: Define Decibel.
  Ans: Decibel (dB) is a unit used to measure the intensity or loudness of sound.
• Q19: How do curtains help in sound absorbing?
  Ans: Curtains absorb sound waves and reduce echo and noise inside a room.
• Q20: Define Sound Insulation.
  Ans: Sound insulation is the prevention of sound from passing through walls, floors, or ceilings.
• Q21: Name 4 sound insulating materials.
  Ans: Some of the sound insulating materials are as follows:

  • ➔ Brick
  • ➔ Cork
  • ➔ Concrete
  • ➔ Gypsum
• Q22: Write 4 methods of sound insulation in buildings.
  Ans: Following are the methods of sound insulation in buildings:

  • ➔ Use of double walls
  • ➔ Floating floors
  • ➔ Discontinuous construction
  • ➔ Use of soundproof doors and windows
• Q23: Define Floating floors.
  Ans: Floating floors are floors separated from the main structural floor by insulation materials to reduce sound transmission.
• Q24: How should rooms be planned for sound insulation?
  Ans: Rooms should be planned with thick walls, proper spacing, and insulation to minimize noise from outside and between rooms.
• Q25: Explain the acoustic design of auditoriums.
  Ans: Acoustic design of auditoriums ensures clear sound distribution, proper reverberation, minimal echo, and comfortable listening for the audience.
• Q26: Name the factors affecting the design of auditoriums.
  Ans: Following factors affect the design of auditoriums:

  • ➔ Shape and size of the auditorium
  • ➔ Materials used on walls and ceiling
  • ➔ Seating arrangement
  • ➔ Sound reflection and absorption
• Q27: Define Pitch of sound.
  Ans: Pitch of sound is how high or low a sound is perceived, depending on its frequency.
• Q28: Define the Silence zone.
  Ans: Silence zone is the area in a building where noise is minimized, ensuring quiet and comfort.
• Q29: Define Absorbing Co-efficient of sound.
  Ans: The absorbing coefficient of sound measures how much sound a material can absorb, ranging from 0 (no absorption) to 1 (total absorption).
• Q30: What is Double wall construction?
  Ans: Double wall construction uses two parallel walls separated by a gap to reduce sound transmission.
• Q31: What is Floating Floor construction?
  Ans: Floating floor construction uses a floor separated from the main structure with insulation to reduce sound vibration.
• Q32: What is Box type construction?
  Ans: Box type construction encloses a room within walls, ceiling, and floor filled with insulating materials for soundproofing.
• Q33: What is Discontinuous construction?
  Ans: Discontinuous construction uses gaps or breaks in walls or ceilings to prevent sound from traveling directly through the structure.
• Q34: Define Cavity wall.
  Ans: A cavity wall is a wall made of two layers of masonry separated by an air gap to improve sound and thermal insulation.
• Q35: How cavity walls help in sound insulation?
  Ans: Cavity walls reduce sound transmission by trapping sound in the air gap between the two layers of masonry.