Ch. 5 Sec. 2 - 4 Flashcards
What happens when someone speaks?
Some of the air molecules get compressed
What happens after the air molecules get compressed?
It returns to the original uncompressed state.
When the sound waves move across the roomBwhay does it cause your eardrums to do?
It causes them to vibrate.
Where are the vibrations sent?
They are sent to the brain to be “decoded”
What does the speed of the wave depend on?
The characteristics of the medium
What is the velocity equation?
v=d/t
What is the velocity equation with wavelength and frequency?
v=f/lambda
What is the period equation?
T==1/f
What does v stand for?
Speed in m/s
What does d stand for?
Distance in m
What does t stand for?
Time in s
What does f stand for?
Wave frequency in Hz
What does lambda stand for?
Wavelength in m
What does T stand for?
Period in s
What is a period?
The time between recurring features of a wave
What is diffraction?
The ability of sound waves to spread out or change direction
When there is a little opening, is there more or less wave diffraction?
More
If there is a big opening, is there a little or big wave diffraction?
Little or less
What is resonance?
The phenomenon of generating sound by blowing into a tube.
What do vibrations in a column of air produce?
It produces sounds as standing waves
The shorter the column, the higher or lower the pitch?
Higher
When the tube is open on both ends, what happens?
The pitch produced by the column is higher than if the column of air is closed at one end.
If the tube is closed at one end, what happens to the pitch and frequency?
The pitch and frequency ⬇️
With an open tube what happens to the wavelength?
1/2lambda or lambda= 2L
What happens to lambda when the tube is closed on one end?
1/4lambda or lambda= 4L
What kind of wave is sound?
A compressional wave
