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Questions and Answers
Match the following sound characteristic with its definition:
Match the following sound characteristic with its definition:
Sound Reflection = Sound reflected off a hard, rigid, and/or flat surface Sound Absorption = Sound waves absorbed into a material upon contact; change of sound energy into some other form Sound Diffusion = Occurrence of sound waves being dispersed equally in a room Sound Diffraction = Acoustical phenomenon causing sound waves to be bent or scattered around obstacles
Match the following terms related to sound absorption with their definitions:
Match the following terms related to sound absorption with their definitions:
Sound Absorption Coefficient (α) = Fraction of energy of the incident sound absorbed by a surface; rates the efficiency of sound absorption of a material at a specified frequency (0-1) Noise Reduction Coefficient (NRC) = Arithmetic average of sound absorption coefficients at specified frequencies, expressed to the nearest multiple of 0.05 Surface Absorption = Sound absorption of a surface obtained by multiplying the area of the surface by its sound absorption coefficient Reverberation = Prolongation of sound as a result of successive reflections in an enclosed space after the source of sound is turned off
Match the following phenomena related to sound with their descriptions:
Match the following phenomena related to sound with their descriptions:
Sound Diffraction = Acoustical phenomenon causing sound waves to be bent or scattered around obstacles such as corners, columns, walls, and beams Sound Refraction = Change of sound wave direction as it moves from one medium to another of different density Sound Transmission = Sound which penetrates through a surface Reverberation = Prolongation of sound as a result of successive reflections in an enclosed space after the source of sound is turned off
Match the following terms related to sound absorption coefficients with their meanings:
Match the following terms related to sound absorption coefficients with their meanings:
Match the following terms related to measuring sound absorption with their definitions:
Match the following terms related to measuring sound absorption with their definitions:
Match the following terms related to various phenomena associated with sound with their explanations:
Match the following terms related to various phenomena associated with sound with their explanations:
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Study Notes
Sound Characteristics
- Sound can be described in terms of its characteristics, including frequency, amplitude, and wavelength.
Sound Absorption
- Sound absorption refers to the process by which a material absorbs sound energy, reducing the amount of sound that is reflected back.
- Sound absorption coefficients are used to measure the ability of a material to absorb sound energy.
Phenomena Related to Sound
- Reflection: the change in direction of a sound wave when it hits a surface.
- Refraction: the bending of a sound wave as it passes from one medium to another.
- Diffraction: the bending of a sound wave around an obstacle or through a small opening.
Sound Absorption Coefficients
- Sabine absorption coefficient: a measure of the amount of sound energy absorbed by a material.
- Noise reduction coefficient (NRC): a measure of the ability of a material to absorb sound energy.
Measuring Sound Absorption
- Impedance tube method: a method used to measure the sound absorption coefficient of a material.
- Reverberation room method: a method used to measure the sound absorption coefficient of a material in a reverberant field.
Phenomena Associated with Sound
- Resonance: the phenomenon of a system vibrating at a specific frequency.
- Echo: a repeated sound that is reflected back to the listener.
- Beat frequency: the frequency at which two sound waves with slightly different frequencies intersect.
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