Ch. 10 Sound Waves (Finals)
An increase of __dB makes the loudness of the sound ten times louder.
10
A 340Hz sound wave travels at 340m/s in air with a wavelength of
1m
Humans can hear until
20,000Hz
The range of human hearing is from about
20Hz-20,000Hz
The amplitude of a particular wave is 1m. The top to bottom distance of the disturbance is
2m
If you see a flash of lightening and hear thunder 11 seconds later, your distance from the lightening flash is about
3850 meters
formula for speed
Speed = Distance times Time
What does waves have in common?
They both carry energy
Sound waves can interfere with one another so that no sound results. (True or False)
True
node
a point at which lines or pathways intersect or branch; a central or connecting point.
All musical sounds have
a regular wave pattern
Sound cannot travel in
a vacuum
A standing wave occurs when
a wave reflects upon itself
Hearing damage can be caused by exposure to sound levels
above 90dB
The Doppler effect is characteristic of __ waves?
all (water, sound, light)
Some of a wave's energy dissipates as heat. In time, this will reduce the wave's
amplitude
The vibrations of a transverse wave move in a direction
at right angles to the direction of wave travel
For light, a red shift indicated the light source moves
away from you
The human ear is most sensitive to sounds with frequencies of
between 2000 and 4000
constructive interference
builds the wave
destructive interference
cancels both waves
Wind instruments produce sound by
causing a column of air to vibrate
Sound travels slower in air if the air is
cold
interference
collided wave
As sound waves move through a medium, the particles of the medium are alternately __ and expanded.
compressed
As we become older, the frequency range of human hearing
decreases
In perceiving its environment, a dolphin makes use of
echoes, the Doppler effect, ultrasound (all of the above)
The __ affects its intensity and amplitude.
energy
A bow wave is produced when a wave source moves
faster than the wave it produces
All waves has a particular
frequency
If the compression of one wave arrives at the same time as the rarefaction of another wave, a decrease in __ results.
frequency
If the source of a sound is moving away from you, the __ of the waves reaching your ear will decrease.
frequency
The pitch of a sound wave depends of its
frequency
high pitched sounds have a higher
frequency
When a string vibrates along its whole length, the musical tone produced is called its
fundamental
sound travels slowest through
gas
An observer on the ground hears a sonic boom which is created by an airplane flying at a speed
greater than the speed of sound
ultrasound
highest Hertz humans to hear
In which one of these does sound travel fastest
ice
The vibrations of a longitudinal wave move in a direction
in the same direction
incident waves
incoming waves
As a frequency decreases, the wavelength
increases
As air temperature increases, sound speed
increases
The amount of energy carries by a sound wave determines the __ of the sound.
intensity
White reflects
light
A sound wave is a __ wave
longitudinal
Compressions and rarefaction are characteristics of __ waves?
longitudinal
The sound produced by a long guitar vibrating SLOWLY has a
low pitch
infrasound
lowest Hertz for humans to hear
An explosion occurs 34km away. Knowing that sounds travels at 340m/s, the time it takes for sound to reach you is
more than 20s
Sound waves travels
much faster than water waves
We are best hearing (infrasonic sound, ultrasonic sound, both, or none?)
none
hertz
number of waves per second
A jet raveling at 1500km/h passes between two observers, A and B, as shown in the figure. In a short time, a sonic boom will be hear by
observers A and B only (not the pilot)
contructive inference
occurs when compressions of different waves concede (meet to intersect).
A sound source of high frequency emits a high
pitch
The property of sound that describes the way a sound is hear is a
pitch
Reverberation
prolongation of a sound; resonance.
Which doesn't belong to the same family? 1. Infrasonic 2. ultrasonic 3. radio waves 4. shock waves 5. longitudinal waves
radio waves
Caruso is said to have made a crystal chandelier shatter with his wave. This demonstrates
resonance
The vibration of a violin at the same frequency as the vibration of the violin strings is an example of
resonance
An echo is an example of __.
reverberation
You dip your finger repeatedly into water and make waves. If you dip your finger more frequently, the wavelength of the waves
shortens
Reverberation is a phenomenon you would most likely hear if you sing in the
shower
sound travels faster in a
solid
Sound travels faster in
solid (steel)
Which of the following is not a transverse wave?
sound
An object traveling at the speed of sound creates a
sound barrier (not a sonic boom because that only happens once you travel faster than the speed of sound)
Music is created by using specific pitches, __, and a regular pattern.
sound quality
Sound doesn't travel through
space
The frequency of sound waves depends on the
speed of vibration
An aircraft that flies faster than the speed of sound is said to be
supersonic
The apparent change in pitch of the sound of an automobile horn as a car passes you is an example of
the Doppler Effect
In a longitudinal wave, the compressions and rarefactions travel in
the same direction
A Doppler effect occurs when a source of sound moves
toward and away from you
The __ of the sound wave is affected by the temperature of the medium it passes through.
velocity
If the frequency of a wave decreases and its wavelength remains the same, the __ of the wave will decrease.
velocity (because the smaller the frequency the smaller the velocity: wavelength=velocity/frequency)
The source of all sounds is something that is
vibrating
The source of all wave motion is a
vibrating object
Sound travels faster in air if the air is
warm
refraction
wave bending
formula for wavelength
wavelength= velocity/frequency
Write out the equation for wavelength
wavelength=velocity/frequency
echo
when light waves are reflected
Compression
when molecules are close
standing wave
when waves with the same wavelength and frequency moves in opposite directions meet, they combine.
Black light absorbs
white light