1 | Page
PSY355 E3 Questions and Correct
Answers/ Latest Update / Already
Graded
What is the definition of sound as a physical phenomenon?
Ans: Pressure changes in a medium; the air molecules or other molecules
themselves don't move
What is a pure tone?
Ans: It is the tone of a single frequency of vibration; created by sine
waves
What is amplitude?
Ans: Change in atmospheric pressure produced by the sound wave;
difference b/w atmospheric pressure and maximum pressure in the sound
wave; measured in decibels and related to loudness
What is frequency?
,2 | Page
Ans: Number of times per second the wave repeats; measured in Hertz
(Hz)
What is the decibel of just noticeable difference?
Ans: About 1 dB
10 x amplitude = ?
Ans: 20 more dB
100 Hz = how many cycles/second?
Ans: 100 cycles/second
What does frequency correspond to?
Ans: Perceptions of pitch
What Hz range can humans sense?
,3 | Page
Ans: 20-20,000 Hz
What Hz does human sensitivity peak at?
Ans: 3,000 Hz
What does aging result in (in terms of hearing)?
Ans: High frequency hearing loss
What is "the mosquito"?
Ans: 17,000 Hz sound, marketed first as an "unruly teenager" deterrent,
and later, as a ringtone
When my eardrum vibrates in response to a sound...
Ans: A pressure wave created by the source of the sound is causing air
molecules in my ear to move side to side and bounce off my eardrums
Most sounds are -
, 4 | Page
Ans: complex tones
What are complex tones?
Ans: Tones composed of many pure tones
The pure tones that make up a complex tone can be shown in a -
Ans: frequency spectrum
The pitch of a complex tone is determined by the -
Ans: reception rate
A complex tone is made up of -
Ans: harmonics
What are harmonics?
PSY355 E3 Questions and Correct
Answers/ Latest Update / Already
Graded
What is the definition of sound as a physical phenomenon?
Ans: Pressure changes in a medium; the air molecules or other molecules
themselves don't move
What is a pure tone?
Ans: It is the tone of a single frequency of vibration; created by sine
waves
What is amplitude?
Ans: Change in atmospheric pressure produced by the sound wave;
difference b/w atmospheric pressure and maximum pressure in the sound
wave; measured in decibels and related to loudness
What is frequency?
,2 | Page
Ans: Number of times per second the wave repeats; measured in Hertz
(Hz)
What is the decibel of just noticeable difference?
Ans: About 1 dB
10 x amplitude = ?
Ans: 20 more dB
100 Hz = how many cycles/second?
Ans: 100 cycles/second
What does frequency correspond to?
Ans: Perceptions of pitch
What Hz range can humans sense?
,3 | Page
Ans: 20-20,000 Hz
What Hz does human sensitivity peak at?
Ans: 3,000 Hz
What does aging result in (in terms of hearing)?
Ans: High frequency hearing loss
What is "the mosquito"?
Ans: 17,000 Hz sound, marketed first as an "unruly teenager" deterrent,
and later, as a ringtone
When my eardrum vibrates in response to a sound...
Ans: A pressure wave created by the source of the sound is causing air
molecules in my ear to move side to side and bounce off my eardrums
Most sounds are -
, 4 | Page
Ans: complex tones
What are complex tones?
Ans: Tones composed of many pure tones
The pure tones that make up a complex tone can be shown in a -
Ans: frequency spectrum
The pitch of a complex tone is determined by the -
Ans: reception rate
A complex tone is made up of -
Ans: harmonics
What are harmonics?
