acoustics Flashcards
True/False: sound propagates though air or another medium and can propose through a vacuum?
False: it cannot propagate through a vacuum (pg.48)
areas of higher density and pressure are called ares of _______ and areas of lower density and pressure are called areas of ______
condensation and rarefaction (pg.48)
a sound’s ______ is a count of the number of repetitions of a cyclic patter in 1 second
frequency (f) (pg.48)
what are the most common measurement units of sound?
Hertz (Hz) and kilohertz (kHz) (pg.48)
True/False: periodic sounds have a frequency but aperiodic sounds do not
true (pg.48)
frequency is perceives as what?
pitch (pg.48)
what are intervals between sounds?
semi tones (pg.48)
how many semitones are in an octave?
12 (pg.48)
what is an octave?
a doubling of frequency (pg.48)
what is the duration of one cycle referred to?
period (T) (pg.48)
True/False: frequency and time have an inverse relationship?
true (pg.48)
what is the physical measure of extent of vibrational change from resting position
amplitude (pg.48)
what is the peak amplitude?
the maximum pressure reached by the pressure wave
what is the root mean square amplitude?
root mean square amplitude (pg.48)
what is the power of a sound over a particular area?
intensity (pg.49)
what is intensity measured in?
watts (pg.49)
amplitude and intensity are both measured in…
decibels (dB) (pg.49)
what is the quietest sound that can be heard?
0 dB (pg.49)
amplitude and intensity are both measured in…
decibels (dB) (pg.49)
amplitude= dB-SPL intensity= dB- IL
what is a pascal?
the cute little lizard from tangled… Just kidding it is the measure of units of pressure
(pg.49)
physical measures of amplitude and intensity are perceived as what?
loudness (pg.49)
human hearing is most sensitive to sounds between __ and __
2 and 4 kHz (pg.49)
what is the length of time a sound continues?
duration (pg.49)
what is the distance travelled by a sound during a single cycle?
wavelength (pg. 49)