Wave Properties
Frequency
What's In Your Ear?
What Sound Does
Review
100
If a sound wave has a high frequency, it also has the sound of a high __.
pitch
100
Name a device that uses two different frequencies to send and receive messages.
a cell phone
100
Sound waves cause the ear drim, hammer, anvil and stirrup to:
vibrate
100
A sonic boom is produced by a jet. The jet must be traveling faster than:
the speed of sound
100
Name two electric conductors. [3 for a double click]
as well as gold, silver, brass, bronze, steel to name a few... you can't just say metal
200
Which property of waves makes a TV louder or softer?
amplitude
200
Name a device that uses the same frequency to send and receive messages.
walkie-talkie or CB radio
200
Hairs inside the cochlea bend, stimulating the auditory nerve which sends electrical signals to the:
brain
200
What is it called when a sound wave is reflected by a hard material?
echo
200
Which is constructive interference and which is destructive interference?
constructive interference destructive interference
300
What kind of wave can only move through a medium?
a mechanical wave
300
What is the difference in a rarefaction and a compression?
A rarefaction is the part of a sound wave that is spread out; a compression is the part that is close together.
300
In the inner ear, vibrations create waves in the liquid inside the:
cochlea
300
When Deena struck a tuning fork and held it close to a string on a guitar, the string began go on its own and make a sound.
What word best explains why the string vibrated without anyone touching it?
resonance
300
What carries individual bits of information in separate units of time?
Digital signals
400
When the medium for sound changes from gas to solid, what will happen to the speed of the sound waves?
The speed will increase.
400
If the distance between E and F decreased, the ___ has decreased.
amplitude
400
Which of the three main parts of the ear converts vibrations into electric signals?
The inner ear
400
The picture shows a sound wave creating ___ and ___ in a ___.
...a sound wave creating compressions and rarefactions in a medium
400
Contrast constructive and destructive interference.
When two waves meet in such a way that their crests line up together, then it's called constructive interference. The resulting wave has a higher amplitude. In destructive interference, the crest of one wave meets the trough of another, and the result is a lower total amplitude.
or something like that
500
An ambulance has its siren on. If the siren is decreasing in pitch, the ambulance the ambulance must be __ relative to you.
moving away
500
The image above shows a sound wave from a radio transmitter. If the fequency decreases, the distance between A and C will:
increase
500
A
500
What occurs when two or more waves overlap and combine to form one wave?
interference
500
Which statement explains why the string vibrated without anyone touching it?
A. Destructive interference between its sound waves and those of the tuning fork made it vibrate.
B. The tuning fork and the guitar string both created mechanical waves. C. The tuning fork produced ultrasonic frequencies beyond human hearing.
D. The string vibrated because of resonance, which happened because the tuning fork and guitar string have the same natural frequency.
What is a continuous wave that may vary in strength or frequency?
D