Characteristics of Sound Quiz

6 Questions

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:

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:

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:

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 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)

Match the following terms related to measuring sound absorption with their definitions:

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 Sound Absorption Coefficient (α) = Fraction of energy of the incident sound absorbed by a surface; rates the efficiency of sound absorption at a specified frequency (0-1)

Match the following terms related to various phenomena associated with sound with their explanations:

Sound Diffusion = Occurrence when sound waves are dispersed equally in a room Sound Refraction = Change of sound wave direction as it moves from one medium to another with different density Sound Transmission = Penetration of sound through a surface Reverberation = Prolongation of sound as a result of successive reflections in an enclosed space after the source is turned off

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.

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.

Test your knowledge about the characteristics of sound including sound reflection and sound absorption. Learn about concepts like sound absorption coefficient and noise reduction coefficient.

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