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Physics - Sound Flashcards | StudBud
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Physics - Sound
Physics - Sound
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1
When the frequency of a force applied to a system matches the natural frequency of a system...
resonance occurs
changes in timbre occur
random vibration occurs
damping occurs
2
The perceived loudness of a running vacuum is about...
10 dB
120 dB
30 dB
70 dB
3
Sound waves are what type of wave?
electromagnetic
transverse
seismic
longitudinal
4
A train moves toward an observer. The sound is perceived by the observer is ...
higher in pitch than perceived by a passenger
lower in pitch than perceived by a passenger
the same as perceived by a passenger on the train
a different timbre
5
In general, sound travels faster...
through gases than through liquids
through gases than through solids
through empty space than through matter
through solids than through gases
6
What is the region of a sound wave in which the density and pressure are greater?
compression
rarefaction
trough
wavelength
7
The highness or lowness of a sound, or our perception of frequency, is called what?
loudness
timbre
pitch
intensity
8
The speed of sound in air does what, when temperature increases?
it decreases
it remains the same
it increases
9
The Tacoma Narrows bridge collapsed in 1940, because winds caused what to build up?
a standing wave
compressions
friction
longitudinal waves
10
What happens to pitch when frequency increases?
it increases
it remains the same
it decreases
11
What wave property increases when the loudness and intensity of a sound increase?
pitch
wavelength
frequency
amplitude
12
The Doppler effect occurs with...
only light waves
only sound waves
only water waves
all waves
13
The variation of amplitude in sounds due to two slightly different frequencies are called...
beats
resonance
sympathetic vibrations
the Doppler effect
14
Frequencies below 20 Hz are considered to be...
supersonic
infrasonic
ultrasonic
subsonic
15
If you are a passenger on a moving train, as the whistle blows, the pitch ...
becomes lower
remains the same
becomes higher
16
The intensity of a sound at any distance is directly proportional to the sound's...
power
wavelength
frequency
pitch
17
Musical instruments of different types playing the same note, may be identified by their...
intensity
frequency
pitch
timbre or sound quality
18
Sounds above 20 000 Hz are considered to be...
supersonic
subsonic
ultrasonic
infrasonic
19
What are the units for frequency?
watts
decibels
hertz
watts per square meter
20
A tuning fork of 345 Hz and a tuning fork of 342 Hz are struck simultaneously. How many beats?
342
4
345
3
21
Sounds above 120 dB are above the...
threshold of hearing
threshold of pain
ultrasonic
Doppler effect
22
The perceived loudness (relative intensity) of a sound is measured in...
hertz
decibels
watts per square meter
watts
23
When standing waves occur in an air column open at one end and closed at the other...
all harmonics are present
only odd harmonics are present
only even harmonics are present
24
At a large distance from the source of a sound, spherical wave fronts are viewed as what?
plane waves
wavelengths
rays
troughs
