QUIZ 1

• True or False? Answer: True


  In furnishing a room, the rear part of the room /wall should be absorptive.
• Wavelength


  Distance between similar points on successive waves or the distance the sound travels in one cycle of vibration
• Acoustics


  The science of sound and vibration which refers to stress fluctuations as well as waves in a material medium
• 50 decibels

  The sound pressure level of normal conversation.
• True or False? Answer: True


  Normal speech is audible from 20-30 m in direction of speech.
• Reverberation


  The persistence of sound after the source of sound has stopped
• Sabin


  The unit of absorption.
• Dead room


  A room characterized by large amount of sound absorption.
• from top to bottom: A, B, C, D

  
  

  Answer:D (concave surface)


  Which shape of a room will help you focus more on the sound source or speaker?

  
• Watt per square meter


  Unit of intensity.
• Echo


  A sound wave reflected or returned with sufficient magnitude and delay so as to be perceived as a sound distinct from the directly transmitted sound.
• Frequency


  Number of cycles of compression and rarefaction of air makes in given unit of time or one second.
• Sonic


  Deals with technical application of mechanical waves in basic scientific research, industry, and medicine
• True or False? Answer: False (ceilings should have reflective sound boards)


  Rooms with high ceilings should have absorptive sound boards.
• Transmission path


  The path can be made to transmit more or less sound.
• Decibel


  A logarithmic unit used to measure sound level.
• Diffusion


  The scattering or random redistribution of a sound wave from a surface.
• Trueor False? Answer: True (because of the shape of the room)


  Breaking wall and ceiling surfaces produces even sound distribution.
• True or False? Answer: False ("3:4:8")


  The Golden section for rooms is: "2:3:5"
• Loudness


  An attribute for a sound that places perception on a scale ranging from inaudible/quiet to loud/uncomfortable, in response to change in sound pressure level
• Threshold of pain

  Minimum sound pressure level which stimulates the ear to a point which is painful.
• Noise


  A sound produced by impact, vibrating bodies, even by speech or music
• Flutter Echo


  A rapid of succeeding echoes caused by the reflection of sound waves back and forth between two parallel surfaces, with sufficient time between each reflection to cause the listener to be aware of separate, discrete signals.
• Period


  The time required for one wavelength to pass a certain point. Generally, a longer period indicates a longer pitch.
• Reflection


  The return of sound wave from a surface.
• 343 m/s


  The speed of sound in air.
• Creep room


  A reflection of a sound along a curved surface.
• Architectural Acoustics


  The technology of designing spaces, structures, and mechanical systems to meet hearing needs.
• True or False? Answer: True


  Reverberation is caused by reflection of direct sound from wall and ceiling surfaces.
• Pitch


  The degree of highness and lowness of tone.