Sound Flashcards
What produces a Sound Wave?
A vibration
What is the same direction as the wave?
Oscillations
How do air molecules move when producing a sound wave?
Backwards and Forwards
What does sound need?
It needs a medium like a solid, liquid or gas
Are sound waves Longitudinal?
Yes
Does sound die out?
No, it just spreads out
What can sound not travel through?
A vacuum
Why can’t sound travel through a vacuum?
There are no Air molecules to vibrate.
How many times are solids more denser than gas?
1000 more times
What happens if particles are very close together?
The vibration is passed along more quickly.
What travels faster, light or sound?
Light
What does sound waves transfer?
Energy
What does amplitude mean?
It is the maximum amount of vibrations as measured from the middle wave.
What is amplitude measured in?
It is measured in hz
What is frequency measured in?
It is measured in hertz
What does frequency mean?
It is the number of waves produced in one second.
What is the top of a wave called?
A peak or crest
What does wavelength mean?
It is the distance between two corresponding points on a wave
What is wavelength measured in?
Measured in Hertz
What is the bottom of the wave called?
A trough
What are three properties of a wave?
Amplitude, Frequency and wavelength.
What is an echo?
It is when sound bounces of two or more surfaces that reflects from each other.
What is absorption?
It is when some of the sound wave is absorbed to make a quieter sound.
What happens if you want to make a higher pitched sound?
You need to make something vibrate faster so that there are more waves per second.
If you change the frequency, does it affect the amplitude?
No it doesn’t
What property of a sound wave affect the pitch of the sound?
The frequency
