Sound Flashcards
What is Timbre?
The quality of sound or tone.
What is Frequency?
The frequency of sound is how quickly the compressions are passed on per second.
What is Pitch?
Pitch is how high or low a sound seems.
What is the intensity of a sound?
Intensity is the amount of energy it has.
What is the speed of sound?
340 meters per second. (in air)
Can sound travel in a vacuum?
No, sound needs a medium to travel through. Sound travels faster in denser mediums.
Why does sound travel faster in denser mediums?
Because in denser materials particles are closer together and can bump into each other quicker.
How do we measure loudness?
In decibels (dB)
Which colors are needed to create cyan?
Blue and green
Which colours are needed to create magenta?
Blue and red
Which colours are needed to create yellow?
Red and green
What are the primary colours of light?
Red, green and blue
What are the secondary colours of light?
Cyan, magenta and yellow
Describe the process of how sound travels through your ear
- Outer ear (PINNA) collects sound waves
- Sound is amplified as it travels down the ear canal to ear drum
- Sound waves cause the ear drum to vibrate, this makes the malleus (‘HAMMER’) vibrate.
- The vibration is passed down to the incus (“ANVIL”)
then to the staples. - When the stapes (“STIRRUP”) move, it causes a fluid in the cochlea to move.
- Nerve endings in the CHOCHLEA convert the vibrations to an electric signal.
- The signal travels along the AUDITORY NERVE and into the brain. The brain helps us hear the impulse as sound.
What is refraction?
Refraction is the bending of light rays as they move from one medium to another. This occurs because the speed of light changes when the rays change mediums.
What is refractive index?
The speed of light in a medium.
What is the incident ray?
The light ray moving toward the border between two mediums.
What is the refracted ray?
The ray that has entered the second medium.
What is the angle of incidence?
The angle between the normal and the incident ray.
What is the angle of refraction?
The angle between the normal and the refracted ray.
What happens when light enters an optically denser medium?
Light rays slow down and bend inwards, TOWARDS the normal. e.g: air to glass.
What happens when light enters an optically less dense medium?
Light rays speed up and bend AWAY from the normal.
What happens when light enters at a right angle?
The light ray changes speed, but not direction.
What happens when light enters a medium of the same density?
The light does not bend.
