SLHS 305 Exam 2 with Questions and
Correct Answers 2025
Acoustics ,- ,CORRECT ,ANSWER-Properties ,of ,sounds ,as ,they ,travel ,in ,air ,and ,how
,they ,are ,affected ,by ,objects ,in ,their ,environment
Waveform ,(time ,domain) ,- ,CORRECT ,ANSWER-When ,the ,pattern ,of ,movement ,is
,displayed ,with ,amplitude ,as ,a ,function ,of ,time
Condensation ,- ,CORRECT ,ANSWER-Increased ,density ,of ,air ,molecules, ,corresponds
,with ,an ,increase ,in ,sound ,pressure
Rarefaction ,- ,CORRECT ,ANSWER-Decreased ,density ,of ,air ,molecules, ,corresponds
,with ,a ,decrease ,in ,sound ,pressure
Simple ,vibrations ,- ,CORRECT ,ANSWER-Also ,called ,"pure ,tones" ,
Characterized ,by ,their ,physical ,(acoustic) ,dimensions ,of ,frequency, ,amplitude, ,and
,starting ,phase.
Pure-tone ,(sine ,wave) ,- ,CORRECT ,ANSWER-"sinusoids"
"Regular ,repetitive ,movements"
Relative ,to ,phase ,angle ,(sin ,θ)
Sin ,θ ,= ,x/r
Cycle ,- ,CORRECT ,ANSWER-The ,pattern ,of ,movement ,as ,the ,object ,goes ,through ,its
,full ,range ,of ,motion ,one ,time
One ,cycle ,represents ,the ,movement ,of ,an ,object ,from ,its ,starting ,point, ,to ,maximum
,peak, ,to ,negative ,peak, ,back ,to ,its ,starting ,point
Frequency ,(and ,units) ,- ,CORRECT ,ANSWER-How ,many ,cycles ,occur ,per ,second
Units: ,Hertz ,(Hz)/ ,kilohertz ,(kHz)
1kHz ,= ,1000 ,Hz
Ex: ,vibration ,that ,repeats ,itself ,100 ,cycles ,per ,second ,is ,called ,100 ,Hz ,pure ,tone.
Frequency ,range ,of ,audibility ,for ,humans ,is ,20-20,000 ,Hz
, Period ,(and ,units; ,also ,converting ,s ,and ,ms) ,- ,CORRECT ,ANSWER-Time ,that ,it
,takes ,to ,complete ,one ,cycle
Units: ,Seconds ,(s), ,Milliseconds ,(ms)
1 ,ms ,= ,.001s
T ,= ,1/f ,or ,f ,= ,1/T
Period ,may ,be ,converted ,from ,seconds ,(s) ,to ,milliseconds ,(ms): ,
,s ,* ,1000 ,= ,ms
Starting ,phase ,(and ,position ,re ,cycle/circle) ,- ,CORRECT ,ANSWER-Where ,a ,vibration
,starts ,in ,it's ,cycle ,is ,called ,starting ,phase, ,e.g., ,90, ,180, ,270 ,degree ,starting ,phases
One ,complete ,cycle ,can ,be ,represented ,as ,angles ,round ,a ,circle
Sound ,can ,be ,cancelled ,out ,if ,the ,condensation ,points ,were ,met ,by ,an ,equal
,rarefaction ,point ,(displacement ,would ,be ,0)
Amplitude ,(peak, ,peak ,to ,peak, ,rms) ,- ,CORRECT ,ANSWER-Amount ,of ,displacement
How ,far ,an ,object ,moves ,back ,and ,forth ,and/or ,the ,amount ,of ,maximum ,and
,minimum ,air ,pressure ,created.
magnitude ,of ,a ,sound ,(larger ,the ,magnitude, ,higher ,the ,amplitude)
Amount ,of ,displacement ,
(expressed ,in ,units ,of ,displacement, ,intensity, ,or ,pressure)
rms= ,.707 ,x ,Peak
RMS ,(root-mean-squared)
-Square ,each ,of ,the ,instantaneous ,amplitudes ,to ,eliminate ,any ,negative ,values
-Average ,the ,squared ,values
-Take ,the ,square ,root ,of ,the ,average
Peak-to-Peak ,Amplitude ,(Ap-p)
-Take ,the ,amplitude ,change ,that ,occurs ,between ,the ,positive ,peak ,and ,the ,negative
,peak
Peak ,Amplitude ,(Ap)
-Measure ,the ,amplitude ,from ,baseline ,(zero) ,to ,one ,of ,the ,peaks
Correct Answers 2025
Acoustics ,- ,CORRECT ,ANSWER-Properties ,of ,sounds ,as ,they ,travel ,in ,air ,and ,how
,they ,are ,affected ,by ,objects ,in ,their ,environment
Waveform ,(time ,domain) ,- ,CORRECT ,ANSWER-When ,the ,pattern ,of ,movement ,is
,displayed ,with ,amplitude ,as ,a ,function ,of ,time
Condensation ,- ,CORRECT ,ANSWER-Increased ,density ,of ,air ,molecules, ,corresponds
,with ,an ,increase ,in ,sound ,pressure
Rarefaction ,- ,CORRECT ,ANSWER-Decreased ,density ,of ,air ,molecules, ,corresponds
,with ,a ,decrease ,in ,sound ,pressure
Simple ,vibrations ,- ,CORRECT ,ANSWER-Also ,called ,"pure ,tones" ,
Characterized ,by ,their ,physical ,(acoustic) ,dimensions ,of ,frequency, ,amplitude, ,and
,starting ,phase.
Pure-tone ,(sine ,wave) ,- ,CORRECT ,ANSWER-"sinusoids"
"Regular ,repetitive ,movements"
Relative ,to ,phase ,angle ,(sin ,θ)
Sin ,θ ,= ,x/r
Cycle ,- ,CORRECT ,ANSWER-The ,pattern ,of ,movement ,as ,the ,object ,goes ,through ,its
,full ,range ,of ,motion ,one ,time
One ,cycle ,represents ,the ,movement ,of ,an ,object ,from ,its ,starting ,point, ,to ,maximum
,peak, ,to ,negative ,peak, ,back ,to ,its ,starting ,point
Frequency ,(and ,units) ,- ,CORRECT ,ANSWER-How ,many ,cycles ,occur ,per ,second
Units: ,Hertz ,(Hz)/ ,kilohertz ,(kHz)
1kHz ,= ,1000 ,Hz
Ex: ,vibration ,that ,repeats ,itself ,100 ,cycles ,per ,second ,is ,called ,100 ,Hz ,pure ,tone.
Frequency ,range ,of ,audibility ,for ,humans ,is ,20-20,000 ,Hz
, Period ,(and ,units; ,also ,converting ,s ,and ,ms) ,- ,CORRECT ,ANSWER-Time ,that ,it
,takes ,to ,complete ,one ,cycle
Units: ,Seconds ,(s), ,Milliseconds ,(ms)
1 ,ms ,= ,.001s
T ,= ,1/f ,or ,f ,= ,1/T
Period ,may ,be ,converted ,from ,seconds ,(s) ,to ,milliseconds ,(ms): ,
,s ,* ,1000 ,= ,ms
Starting ,phase ,(and ,position ,re ,cycle/circle) ,- ,CORRECT ,ANSWER-Where ,a ,vibration
,starts ,in ,it's ,cycle ,is ,called ,starting ,phase, ,e.g., ,90, ,180, ,270 ,degree ,starting ,phases
One ,complete ,cycle ,can ,be ,represented ,as ,angles ,round ,a ,circle
Sound ,can ,be ,cancelled ,out ,if ,the ,condensation ,points ,were ,met ,by ,an ,equal
,rarefaction ,point ,(displacement ,would ,be ,0)
Amplitude ,(peak, ,peak ,to ,peak, ,rms) ,- ,CORRECT ,ANSWER-Amount ,of ,displacement
How ,far ,an ,object ,moves ,back ,and ,forth ,and/or ,the ,amount ,of ,maximum ,and
,minimum ,air ,pressure ,created.
magnitude ,of ,a ,sound ,(larger ,the ,magnitude, ,higher ,the ,amplitude)
Amount ,of ,displacement ,
(expressed ,in ,units ,of ,displacement, ,intensity, ,or ,pressure)
rms= ,.707 ,x ,Peak
RMS ,(root-mean-squared)
-Square ,each ,of ,the ,instantaneous ,amplitudes ,to ,eliminate ,any ,negative ,values
-Average ,the ,squared ,values
-Take ,the ,square ,root ,of ,the ,average
Peak-to-Peak ,Amplitude ,(Ap-p)
-Take ,the ,amplitude ,change ,that ,occurs ,between ,the ,positive ,peak ,and ,the ,negative
,peak
Peak ,Amplitude ,(Ap)
-Measure ,the ,amplitude ,from ,baseline ,(zero) ,to ,one ,of ,the ,peaks
