This document contains a BIOMEDICAL PHYSICS model examination with final exam review questions and answers. It tests knowledge on various biomedical physics topics
Sound Amplification in the outer ear is (auditory canal) is affected by - Sound Pressure
Prolonged exposure to loud noise can cause permanent damage to? - Inner ear
The loss of elasticity (stiffening) of the tympanic membrane will result in - Decrease of
hearing threshold
Sound intensity level (dB) and Loudness (Phones) will have the same magnitude at the
following frequency - 1000 Hz
Equal Loudness curve:
At frequency of 4000 Hz the perceived sound is - Louder than at 1000 Hz
Sound intensity level is proportional to the logarithm of the ratio of incoming to threshold
intensity SIL= 10. LOG (I/I0) If intensity is increased by a factor of 100, what is change
in SIL - Increase with 20 dB (plus 20dB)
The sound intensity level in a room is 20dB. A TV produces additional intensity level of
60 dB. What is the sound intensity in the room now? - 60dB
Match the physical (objective) with the corresponding psychophysical (subjective)
properties of the sound
Frequency ........
Intensity .......
Acoustic Spectrum ......... - Frequency - Timbre
Intensity - Pitch
Acoustic Spectrum - Loudness
Sound Frequency is - Physical property (objective)
,The fundamental harmonic (frequency f0) in a complex sound is characterised by - The
lowest frequency and highest amplitude
The speed of sound is calculated by the Newton - Laplace formula c = k/p (square
rooted) where K is the stiffness coefficient, and p is the density of the material. If the
density of the substance doubles, the speed of propagating sound wave will - Decrease
What is the speed of sound in air - 330m/s
Does absorption of sound and the corresponding penetration depth depend on the
wavelength? - It does. There is less absorption at longer wavelengths, and they
propagate deeper
Is it possible for internal organise to generate sounds that propagate to the skin and are
audible? - Yes, Organs produce sounds that propagate through the tissues and are
audible at the skin
Noise can be defined as - Superposition of random sound vibrations, with frequency
and amplitude constantly changing in time
Damping oscillations are - oscillations with decreasing amplitude
If the amplitude of a wave doubles (x2), what would happen to the period? - There will
be no change
In which of the following mediums, sound waves cannot propagate? - Vacuum
Which of the following waves are not mechanical? - Light
A propagating sound wave transfers - Energy
Which of the following factors has the most significant effect on the speed of
propagation of sound waves? - Elastic properties of the medium
Sound waves are - mechanical waves
The speed of sound ( in non dispersive medium) - Depends on the properties of the
propagating medium
Human ear is most sensitive to frequencies ( refer to equal loudness curve) - From 2000
Hz to 5000Hz
What is meaning of 0dB - The sound is at threshold reference level
Timbre is - Psychophysical (subjective) sound property
, The pitch of sound depends mostly on - Sound frequency
Which of the following does not have relevance to the reflection/transmission of sound
waves? - The colours of substances near the boundary area
Timbre is related to - Harmonic overtones
Weber-fechner law (in psychophysics) describes a logarithmic relationship between the
intensity of a sound wave and ......? - The perception of loudness
Intensity is defined as? - Power per area
When sound wave travels across two materials with similar acoustic impedance, at the
boundary surface will be - more transmission and less reflection
The acoustic impedance Z of a substance is defined as the product of - The density and
the speed of sound: pv
Why can't we hear voices ( speech) when submerged under water? - Most of the sound
is reflected at the air/water boundary
What property of sound is measured in decibels (dB) - intensity level
If the period of a wave is 0.02s, what is its frequency? (how often does it vibrate in one
second?) - 50Hz
A person screams in the mountain and hears the echo after 2 seconds. How far was the
cliff that caused the reflection of the sound (echo) - 340m
Which of the following properties of sound is measured in Hertz (Hz) - Frequency
When sound wave propagates between two media with similar impedance, there will
be..... - more transmission and less reflection
The human ear is sensitive to frequencies in the range - 20Hz -2000Hz
What are the SI units for loudness - Phon
The speed of sound in the human body is approximately - 1500m/s
The audiogram is a method for hearing loss evaluation by measuring the threshold
hearing intensity of sound for different - Frequencies
Pure tone is characterised by - Constant frequency
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