Study guide Flashcards
Two essential physical (measurable) characteristics of sound are:
Frequency and Pitch
The ______ of sound is determined by the number of sound waves that occur over one second of time, or cycles per second, and is measured in Hz.
Frequency
A ______ is the simplest form of sound and can be described as a discrete tone of a single frequency.
Pure tone
Examples of complex tones include of the following, except:
A. Tuning Forks
B. Speech
C. Music
D. Noise
Tuning Forks
What is the range of frequencies for human hearing?
20Hz-20,000Hz
Most speech sounds occur in which frequency range?
250Hz-4000Hz
Which of the following is not a frequency tested for hearing conservation purposes?
A. 500Hz
B. 1500 Hz
C. 4000 Hz
D. None of the above
1500Hz
A decibel (dB) is:
A. A unit of sound measurement perceived as loudness
B. Logarithmic
C. Perceived as pitch
D. Both a and b
E. All of the above
A unit of sound measurement perceived as loudness.
And Logarithmic
The difference between SPL and HL is?
SPL is used to measure sound pressure in the environment
HL is used to measure hearing
A filter that mimics the way the human ear hears and is used to measure worker noise
dB A
A scale where 0 dab represents the average hearing threshold for young, normal adults.
dB HL
A scale used to measure absolute sound pressure
dB SPL
A filter that provides a flat (linear) response over most of the audible frequency range
dB C
Hearing threshold level is:
The softest level at which the listener responds at least 50% of the time.
Label the dB HL range with the corresponding classification of hearing
0-25 dB HL ____range of hearing
Normal
