Test 5 Flashcards
What is the effect of intensity on the way the human ear perceives sound?
loudness
What is the most consonant ratio between two notes?
1:2
What is the result when two notes interfere harmoniously?
consonance
What term describes a situation in which a driving frequency on an object is the same as or nearly the same as one of the object’s natural frequencies?
resonance
What is the substance through which a wave transfers its energy?
medium
What term refers to sound that has too low a frequency to be heard?
infrasonic
What technique uses the reflection of sound to calculate distance?
echo ranging
What is the reinforcement or cancellation that occurs when two or more sound waves meet?
interference
What property is directly proportional to wave speed?
wavelength
What happens to a wave when it passes between two media?
bends toward the medium that causes slower speed
What is the relationship between sound intensity and distance?
Intensity is inversely proportional to the square of distance
Why can an echo not be heard if the source of the sound is less than 17 m from the reflecting surface?
The sounds are too close in time to be distinguished
Movies and television shows often include sounds from rocket engines being heard in the vacuum of space. Why is this incorrect?
Sound cannot travel through a vacuum
Which of the following describes the frequency relationships between a fundamental and its overtones?
harmonic series
What is the most dominant sound of a musical note?
fundamental
What is a musical instrument’s distinctive sound quality?
timbre
What is the low point of a wave called?
trough
What is the bending of the path of a wave as a result of a change in wave speed?
refraction
What is a series of organized sound waves with specific pitches that have been deliberately arranged?
music
What is a sound heard distinctly after being reflected from some object?
echo
Which type of wave has particles of the transmitting medium oscillating at right angles to the direction of wave travel?
transverse
What is a random sound with no intended pattern?
noise
high point of a wave train
crest
number of waves that pass a point per unit time
frequency
maximum distance particles are displaced in a wave train
amplitude
strength of a sound wave
intensity
perpendicular line from which reflection is measured
narmal
musical distance between two notes
interval
A change in frequency caused by an object’s motion
Doppler effect
The process of dissipating the energy of sound waves in matter.
absorption
vibrations traveling through a medium as longitudinal pressure waves
sound
The portion of a wave in which the particles are spread out is a _______ pulse.
rarefaction
The length of a wave
wavelength
The spreading out of a wave after it passes through a narrow opening
diffraction
The difference in pitch between a note and a second note that has twice the frequency of the first note
octave
The relationship between the angle of incidence and angle of reflection is described by the _______.
law of reflection
The set of frequencies at which an object vibrates are its _______ frequencies.
natural
What is an object traveling faster than the speed of sound called?
supersonic
A periodic back-and-forth motion that transmits energy
wave
The effect of frequency on the way our ear perceives sound
pitch
The speed of a wave is ________ proportional to frequency.
directly
waves that strike an obstacle
incident
The study of sound
acoustics
The period of a wave formula
T=1/f
the speed of sound formula
v= 331 m/s +(0.61m/s)(T/1C)
the frequency of a wave formula
f=N/t
the speed of a wave formula
v=wavelength x frequency
