Sound Flashcards
What is sound caused by?
Vibrations.
What do sounds travel in?
Waves.
What do sound waves travel through?
A medium.
What does a wave transfer?
Energy.
What allows sound to travel?
Particles.
Particles are not transferred in vibrations?
True or false?
True.
How is sound caused ?
Sounds are caused by vibrations of particles which knock each other and pass the vibrations like a Mexican wave.
Do they all travel in the same direction?
The vibrations, waves and energy are all moving in the same direction. ( they ate parallel to each other)
What of these 2 below are perpendicular to each other?
Energy transfer / wave travel / sound / vibration / particles
Direction of energy transfer is perpendicular to the direction the wave travels.
What type of a wave is sound an example of?
Longitudinal
The direction of energy transfer is parallel to the direction of particle vibration in a sound wave.
True or false?
True.
High frequency =
Low frequency =
High frequency= high pitch
Low frequency = low pitch
A high pitch sound has a high ……………= ?
Frequency
A high pitch sound will have more (what) per second and a shorter (what).
What 1=???
What 2= ???
What 1= waves
What 2= wavelength
What is frequency measured in?
Hertz (hz)
What is affected by the speed of vibrations?
Pitch
Why is pitch affected by the speed of vibrations?
For example the faster the eardrum vibrates the higher pitch you hear.
And the slower the eardrum vibrates the lower pitch you hear.
What is frequency?
Frequency, sometimes referred to as pitch, is the number of times per second that a sound pressure wave repeats itself.
What’s amplitude?
Distance between midpoint and top of wave (or bottom/ doesn’t make a difference😅)
The bigger the amplitude (what) the volume.
What= louder
What’s volume measured in?
Decibels (dB)
The volume of a sound is determined by what?
Is determined by the amplitude of the wave.
Volume is determined by the what?
By the size/energy of the vibrations
What is the distance that particles are displaced by vibrations.
Amplitude
Volume is affected by the size of what?
It is affected by the size of amplitude in a wave
When sound waves hit a solid object, they bounce off and go in the opposite direction. What is the technical term for this?
Reflection.
What piece of equipment allows us to see sound waves as pictures?
Oscilloscope
What’s a transverse wave?
In a transverse wave the particles are moving upwards and downwards. Light is an example of transverse waves.
Sound needs a material to travel through; ???
???= a solid, liquid, or gas.
Sound cannot travel through a vacuum.
Why?
Because there are no particles to vibrate. This means no one can hear u scream in space.
Sounds travel fastest in ………… because the particle are close together.
Solids.
Travels more slowly in gases because???
Because particles are more far apart.
Sound travels more slowly in light because??
Give example.
Because we see lightning before we hear the thunder.
If sound travels at 340m/s then in 3 seconds it will travel ………m.
It will travel 1020 m.
Because 340x3=1020. Distance= speed X time
What’s a medium
A medium is anything made up of particles; A solid, liquid or gas.
