IHS Exam Practice Questions and 100% Correct Answers
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Module
IHS
Institution
IHS
Diffraction The bending of a wave as it moves around an obstacle or passes through a narrow opening
Refraction The bending of a wave as it passes at an angle from one medium to another
Reverberation collection of reflected sounds in an enclosure, such as room.
Early reverberation (good) the soun...
IHS Exam Practice Questions and 100%
Correct Answers
Diffraction ✅The bending of a wave as it moves around an obstacle or passes through
a narrow opening
Refraction ✅The bending of a wave as it passes at an angle from one medium to
another
Reverberation ✅collection of reflected sounds in an enclosure, such as room.
Early reverberation (good) ✅the sound that reaches the listener after a small number
of reflections. Enhances comprehension when listening with two ears.
Late reverberation (bad) ✅the sound reaching the listener after several reflections. The
longer the reverberation time, the more challenging it is to understand speech.
Frequency ✅the number of complete wavelengths that pass a point in a given time
Range of human hearing ✅20-20,000 Hz
Resonant frequency of ear canal ✅2700 Hz
Infrasound ✅Sounds with frequencies below the human range of hearing
Ultrasound ✅Sound waves with frequencies above the normal human range of hearing
Fundamental frequency ✅The lowest frequency produced by a vibrating object, also
known as first harmonic (f1)
Octave ✅doubling of frequency
F2, f3, f4 ✅two times the first harmonic (fundamental frequency), three times etc ex:
f1=400, f2=800 f3=1200
Fourier analysis ✅takes a complex waveform and converts it into a number of pure
tones of different frequencies, each having a unique amplitude and phase
Outer and middle ear resonant frequency ✅2700, 5000 Hz
Pitch ✅psychological experience of sound that corresponds to the frequency of the
sound waves
, Dyne ✅unit for measuring sound pressure
The softest sound that the best human ear can detect, in the best listening conditions, is
an effective sound pressure of ✅.0002 dynes/cm2
The loudest sound the normal human ear can tolerate is an effective sound pressure
level of ✅1000 dynes/cm2
Decibel ✅a logarithmic unit of sound intensity. 1/10th of a bel
Human ear natural resonances amplify sounds between ✅1000-5000 hz
There is a 6db increase in sounds when ✅two of the same decibel levels are doubled
Inverse square law ✅intensity is inversely proportional to the square of the distance
from the sound source. Dictates that each doubling of a distance from a source results
in a 6db SPL decrease.
Db HL ✅Intensity designation on an audiometer. Audiometric zero is different at each
frequency.
Db SL (sensation level) ✅level of sound above a patient's threshold
Binaural loudness summation ✅a sound presented to both ears simultaneously is
louder than when it is presented monaurally
Binaural hearing enables listener to ✅- gather spatial information about the listening
environment
-separate signals delivered from multiple sources
-better localize sounds
Azimuth ✅used to describe the location relative to the head using degrees as the
measurement unit, with 0 degrees being directly infront of the listener
Vehicle transmission ✅spread of pathogens via air, drinking water, and food, as well
as bodily fluids being handled outside the body
Airborne transmission ✅The spread of an organism via droplets or dust
Vectorborne transmission ✅transmission thought animals or insects
Most important agent in preventing infection transfer ✅hand hygiene
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