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Physics of Sound! Flashcards | StudBud
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Physics of Sound!
Physics of Sound!
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1
The property of sound that most helps you to identify one person’s voice from another is
harmonics
scales
beats
decibels
2
These four diagrams show amplitude versus time. Which diagram represents a complex sound?
a
b
d
c
3
Musicians may tune their instruments to match a certain frequency by adjusting the frequency they play to eliminate
rhythm
scales
beats
pitch
4
A large explosion generally can be “felt” some distance away because it causes a variation in the:
air temperature
weight of air molecules
air pressure
mass of air molecules
5
Ordinary conversation, measured in decibel units, would be most nearly ____ dB.
125
65
100
15
6
The speed of sound is affected by all of the following EXCEPT:
air temperature
air pressure
mass and size of the molecules it travels through
decibel level
7
Which of the following has the shortest wavelength?
A rumble of thunder at 20 hertz
The highest note on a piano at 5,000 hertz
An average male singer at 500 hertz
The whine of a jet turbine at 10,000 hertz
8
These four diagrams show the amplitude versus time. Which diagram(s) represent single-frequency sound?
a, b, and d
c only
d
a only
9
The oscillation of air pressure can result in ____ waves
longitudinal
light
circular
transverse
10
The perception of sound starts with the:
vibration of the eardrum
response of short hairs of the ear canal
stimulation of the fluid in the cochlea
movement of three delicate bones of the inner ear
11
The term for a regular time pattern in sound is
scale
rhythm
harmony
pitch
12
The speed of sound in air at normal temperatures is about ____ m/s.
3.4
34
3400
340
13
The term applied to objects that travel at speeds exceeding the normal speed of sound in air is:
subsonic
sonogram
reverberation
supersonic
14
The musical effect based upon the relationship between frequencies can be called
rhythm
harmony
beats
pitch
15
A combination of frequencies which sounds bad or is unsettling is called
consonance
dissonance
pitch
harmony
16
The loudness of sound is measured in units called:
hertz
newtons
decibels
pascals
17
Sound shows wave characteristics for all of the following reasons EXCEPT:
the mass of sound increases as its frequency increases
sound shows evidence of diffraction and interference
sound may be reflected and refracted
the speed of sound is the product of frequency and wavelength
18
Large horns such as tubas produce sounds with longer wavelengths than flutes because:
wavelength is directly proportional to the instrument size
wavelength is directly proportional to frequency
the pitch of the sound is directly proportional to the wavelength
frequency is directly proportional to the instrument size
19
These four diagrams show amplitude versus time. Which diagram represents the loudest single-frequency sound?
d
a
b
c
20
Loud noises damage the ear because
they are transmitted to the ear faster in the atmosphere than quiet noises
their frequency exceeds 20,000 hertz
they can cause tiny hairs in the cochlea to break
they can block the ear canal
21
A guitar player plays notes by placing her fingers at specific positions on the strings. The notes are produced by:
polarization
resonance
refraction
diffraction
22
Sound will travel:
faster in cold air than in warm air
fastest in outer space
faster in steel than in air
faster in air than any material
23
Which of the following statements about reverberations is INCORRECT?
Reverberations are most common in sounds produced outdoors
Reverberations may create dead spots in a large room
Reverberations may cause loud spots in a large room
Reverberation is caused by multiple echoes from walls and ceilings
24
A pitch pipe that produces 440 hertz is _____ the length of one producing 880 hertz
4 times
1/4
1/2
2 times
25
You yell across a wide canyon and hear your echo 3 seconds later. The approximate width of the canyon is ____ meters.
300
1000
100
500
26
A piano and a guitar playing the same “C” note sound different because pianos
produce pure frequencies but guitars do not
have more “strings”(wires) to vibrate than guitars
produce sound with more decibels
and guitars produce different combinations of frequencies
27
The musical term “pitch” is most directly proportional to:
volume
amplitude
wavelength
frequency
28
Ultrasound is useful for all of the following EXCEPT:
sending sounds a human can hear
examining a beating heart
imaging sof tissue in the body
finding a stud in a wall
29
As the decibel level increases from 20 decibels to 40 decibels, the loudness of the sound is described as:
2 times quieted
10 times quieter
10 times louder
2 times louder
30
The speed of sound in air at normal temperatures is about ____ m/s.
200
300
100
1000
31
Due to the Doppler effect, the pitch of the siren of a fire truck moving away from you:
increases
decreases
does not change
increases then decreases
32
On the 4th of July, you see fireworks displays before you hear them because light is about ____ times faster than sound.
0.1
100
10
1,000,000
33
A young child can hear frequencies of sound up to 20,000 Hz, but the highest frequency an average adult can hear is:
1000 Hz
22,000 Hz
100 Hz
15,000 Hz
34
A graph of sound showing frequency versus time and how loud the sound is at various frequencies is called a(n):
spectrum
sonogram
ultrasound
equal loudness curve
35
The marching band practices inside the stadium. You're able to hear the band outside because sound waves are:
enhanced by destructive interference
diffracted over and around buildings
absorbed by the building and trees
refracted by buildings
