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IHS Exam Practice Questions and 100% Correct Answers

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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...

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  • September 22, 2024
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  • Exam (elaborations)
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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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