Section 15.2
The Physics of Music
Practice Test
1.
Octaves have a __________ ratio of frequencies.
a.
1:8
b.
1:2
c.
1:4
d.
1:1
Hint
2.
Sound in a musical instrument like a saxophone is amplified by __________.
a.
the resonance of a pipe
b.
electronic speakers
c.
vibration from the lips
d.
the resonance on a membrane
Hint
3.
The sound from a trumpet results from __________.
a.
vibrating strings
b.
vibrating lips
c.
vibrating brass
d.
vibrating reeds
Hint
4.
The lowest frequency in a sound wave is called the __________.
a.
fundamental
b.
crest
c.
amplitude
d.
trough
Hint
5.
A closed-pipe resonator is __________.
a.
a multiple of the wavelength
b.
1/2 wavelength or multiple thereof
c.
1/4 wavelength or odd multiples thereof
d.
1/3 wavelength or multiple thereof
Hint
6.
Most musical instruments are __________.
a.
closed-pipe resonators
b.
open-pipe resonators
c.
free from resonance
d.
no-pipe resonators
Hint
7.
An open-pipe resonator is ___________.
a.
1/2 wavelength or multiple thereof
b.
1/3 wavelength or multiple thereof
c.
1/4 wavelength or multiple thereof
d.
a multiple of the wavelength
Hint
8.
The sound from a string instrument, like a guitar, results from __________.
a.
vibrating brass
b.
vibrating strings
c.
vibrating reeds
d.
vibrating lips
Hint
9.
Sound waves that amplify in a musical instrument demonstrate __________.
a.
compressional interference
b.
amplified interference
c.
destructive interference
d.
constructive interference
Hint
10.
If in Figure 15-12 the rightmost picture shows resonance for 325 Hz, what is the fundamental frequency of the pipe?
a.
65 Hz
b.
195 Hz
c.
325 Hz
d.
406 Hz
Hint
11.
In Figure 15-13, If the length of the pipe is 0.75 m, what is the third resonant frequency?
a.
457 Hz
b.
150 Hz
c.
686 Hz
d.
915 Hz
Hint
12.
In Figure 15-13, If the length of the pipe is 0.75 m, what is the fundamental wavelength?
a.
0.50 m
b.
0.38 m
c.
0.75 m
d.
1.5 m
Hint
13.
A tunnel can make an echo by acting as a(n) __________.
a.
no-pipe resonator
b.
open-pipe resonator
c.
standing-pipe resonator
d.
closed-pipe resonator
Hint
14.
What causes beat notes in music?
a.
waves with nearly identical frequencies interfering with each other
b.
harmonics interfering with their fundamentals
c.
notes that are at least an octave apart
d.
musical notes that are in consonance with each other
Hint
15.
What produces the human voice?
a.
changes in air temperature
b.
vibrations in the eardrum
c.
vibrations in vocal chords
d.
body heat
Hint
16.
If in Figure 15-12 the rightmost picture shows resonance for 325 Hz, what is the next highest frequency at which resonance will occur?
a.
455 Hz
b.
365 Hz
c.
406 Hz
d.
390 Hz
Hint
17.
Which part of the ear transmits sound signals to nerve cells?
a.
fluid in the ear
b.
tiny hairs in the cochlea
c.
the eardrum
d.
the earlobe
Hint
18.
If the apparatus in Figure 15-9 were set up to resonate for a 440 Hz tuning fork, what, if anything, must be done for it to resonate for a 500 Hz tuning fork?
a.
Hit the fork harder.
b.
No adjustment is needed.
c.
Raise the air tube.
d.
Add water .
Hint
19.
Two or more pitches played together that sound pleasant are __________.
a.
out of tune
b.
in melody
c.
in dissonance
d.
in consonance
Hint
