Module 8A: measuring sound in the real world Flashcards
What is the number of cycles completed per second. It is measured in unites called Hertz.
Frequency
The time is takes to complete one cycle of vibration is called?
Period
Humans can hear a range of frequencies from about 20 hz to?
20 kHZ
The DISTANCE covered by sound in the period is?
wavelength
The DISTANCE between successive rarefaction or compression peaks is known as ?
wavelength
What are multiples of the lowest frequency present in a sound?
harmonics
What is the doubling of frequencies?
Octaves
We perceive frequency as the ____of the sound.
The pitch
True or false. Pitch and frequency as a 1:1 ratio.
FALSE.
What is the magnitude or level of sound?
Intensity
The range of human hearing is approximately ____ from threshold to pain.
120 dB
How we describe our perception of magnitude of sound is called?
loudness
The purpose of sound measurments are all of the following except:
a) to calibrate test equipment
b) to test acoustic levels amongest individuals with thresholds above 20 upA
c) to assess background level in test rooms and learning environments
d) to identify hazardous noise exposure
b) ) to test acoustic levels amongest individuals with thresholds above 20 upA
sound level meters are dependent upon the ?
Microphone
Microphones have a dynamic range. Explain what the means
Range of frequencies the microphone is sensitive to
The most difficult parts of the dynamic range for a sound level meter to measure are :
a) Soft sounds below 20dB
b) loud sounds above 100 dB SPL
c) all the above
c) all the above
A general type 2 sound level meter provides you with
1 number representing the overall amplitude of the sound
A micriphone can be set to a (chose two)?
a) linear response
b) weighting factor
c) frequency response
d) amplitude response
c) magnitude calibration
a) linear response
b) weighting factor
De-Emphasizes low frequency sounds is called? .
weighting factor
Sound level meter (SLM) measures overall SPL of sounds picked up by the microphone is called?
Linear setting
What is a device that measures the pressure of sounds?
Sound level meter (SLM
True or false:
SLM (sound level meters) pick up all frequencies within a certain range?
True
True or false: SLM (sound Level Meters) determins the period of the sound in db SLP
False:
SLM determines the magnitude of the sound in db SLP
Sound level meters are classified according to their accuracy. The lower the number, the more accurate the sound level meter is. True or false
True
A type 1 sound level meter is less accurate than a TYPE II sound level meter. TRUE OR FALSE
False
Which weighting scale is the most like human hearing?
A
Which of the following reference scales is used to measure sound in the environment:
a) dB IL
b) db SPL
c) dB HL
d) dB sL
e) dB IL
b) db SPL
